You've just learned a new English expression:

put off — to delay doing something

"We had to put off the meeting until Friday."

You understand it. You listen to the sentence a few times, repeat it, and perhaps save it to your vocabulary collection.

The next day, you review the same expression. Should you hear exactly the same sentence again? Or would it be better to see something new, like:

"I've been putting off my dentist appointment."

Both sentences teach the same basic meaning. But they give your brain slightly different information.

The first is familiar and easy to recognize. The second asks you to recognize the expression in a new situation.

This raises a surprisingly interesting question: are we learning a word more effectively when we repeat the same example, or when we meet it in different contexts?

Researchers have been studying this question for years. Their findings don't point to one perfect method, but they do offer useful clues about how to practise vocabulary.

1. Why a familiar example sentence helps

When you first encounter an unfamiliar expression, you have several things to figure out.

What does it mean? How is it pronounced? What words usually appear around it? How is it used in a sentence?

A good example makes this easier.

Consider the expression run out of.

You might learn it with:

"We ran out of milk this morning."

The sentence is short, natural, and easy to picture. You can understand that run out of means having no more of something.

Now imagine hearing that same sentence several times.

At first, you might need to think about every word. After a few repetitions, you recognize the expression more quickly. You may even be able to anticipate what comes next.

There's a reason familiarity can help.

In a study published online in 2025, researchers Radha Chandy, Raquel Serrano, and Ana Pellicer-Sánchez investigated how adult learners of English acquired unfamiliar words while reading.

The participants encountered invented words either through repeated readings of the same story or through different stories. Those who reread the same text processed the words more quickly and showed better immediate vocabulary learning.

That advantage wasn't maintained on the later tests, but the short-term result is still informative.

When material is unfamiliar, a stable context can make the first steps of learning easier.

Instead of processing an entirely new sentence each time, you can return your attention to the word or expression you're trying to learn.

This doesn't prove that one fixed example is always best. But it gives us a good reason not to dismiss repetition as something we should avoid.

2. The hidden problem with getting too familiar

There's a catch, though.

Sometimes a sentence becomes so familiar that recognizing it feels almost automatic.

You see:

"We ran out of milk this morning."

And you immediately understand ran out of.

Excellent. But what happens when someone says:

"We're running out of time."

Do you recognize the same expression just as easily?

Or do you hesitate because the words around it have changed?

It's possible to become very good at recognizing a particular sentence without developing equally strong knowledge of the expression inside it.

Think about learning a song in another language. You might be able to sing an entire line from memory, yet struggle to use one of its expressions in an ordinary conversation.

That's because remembering a sentence and knowing how to use its parts are related, but not identical, skills.

The familiar sentence gives you helpful clues. But those clues won't always be available when you encounter the expression elsewhere.

One simple way to check your knowledge is to remove the familiar example.

Can you still explain what the expression means?

Can you recognize it in a different sentence?

Can you use it to say something about your own life?

You don't need to pass all three tests immediately. They simply reveal different aspects of what you've learned.

3. Why different examples can make a difference

Now let's return to run out of.

Imagine encountering it in three sentences:

  • We ran out of milk this morning.
  • We're running out of time.
  • The store ran out of tickets.

The core meaning stays recognizable, but the situations change.

In the first sentence, something is missing from your kitchen. In the second, there's not enough time left. In the third, a store has no tickets remaining.

Each encounter gives you another opportunity to understand how the expression works.

Researchers call this idea contextual diversity: meeting the same word in different linguistic or situational contexts.

A 2019 experiment by Ascensión Pagán and Kate Nation compared learning unfamiliar words through the same sentence repeated four times with learning them through four different sentences.

Interestingly, the varied examples initially took more effort to process. But they produced an advantage on an immediate post-learning measure.

Other experiments have found similar benefits. In a 2020 study of highly proficient Spanish-English bilinguals, participants remembered more word meanings after studying varied semantic contexts than repeated ones. The researchers observed a similar pattern with both written and spoken materials.

More recently, a 2026 systematic review and meta-analysis brought together 20 studies of first- and second-language word learning. Overall, the results supported a beneficial effect of contextual diversity, although the studies used different tasks and definitions of context.

So why might variety help?

One possible explanation is that each new context encourages you to connect the word with a broader range of situations.

Instead of associating run out of mainly with milk, you gradually learn that it can describe many kinds of shortages.

That can help you recognize the expression when it appears somewhere unexpected.

The important point isn't simply to collect more example sentences. It's to develop knowledge that works beyond the original example.

4. But more variety isn't always better

At this point, it might seem that the solution is obvious: give every new word a different example every time it appears.

Unfortunately, the research isn't quite that simple.

Some studies have found that keeping the context consistent can actually help beginners learn a new word's meaning.

For example, a 2023 experiment by Hulme and colleagues compared unfamiliar words presented within one coherent narrative with words presented across several different narratives.

Participants initially learned more semantic information about the words in the consistent-context condition.

And the 2025 study mentioned earlier found an immediate advantage for rereading the same story, without a later advantage for the varied-context condition.

These results don't cancel out the benefits of contextual diversity found elsewhere.

They suggest that the usefulness of variety may depend on the learning stage, the difficulty of the material, and what kind of knowledge we're testing.

If you're struggling to understand a new expression, changing everything around it may simply create more work.

Imagine learning the verb take off for the first time.

One example might describe an airplane taking off. Another might describe someone taking off a jacket. A third might refer to a business taking off.

These examples introduce different meanings of the same form, not merely different situations for one meaning.

Learning all of them at once might be useful for some learners, but unnecessarily confusing for others.

That's an important distinction: varying the context doesn't always mean varying the meaning.

For early practice, it may be better to keep the intended meaning clear while gradually changing the surrounding sentences.

You can explore additional meanings later.

5. A practical approach: start with clarity, then add variety

Research doesn't give us a universal schedule for when to replace a familiar example with a new one.

But it suggests a practical approach worth trying.

First, learn the expression with one clear example

Choose a sentence that makes the meaning easy to understand.

put off

"We had to put off the meeting until Friday."

Listen to it. Read it. Make sure you understand how the expression works.

You don't need five different examples before you've understood the first.

Then, revisit the familiar example

When you return to the expression, hearing the same sentence again is perfectly reasonable.

You might recognize it more quickly, remember the meaning without translation, or pay closer attention to its pronunciation.

If you're using an audio vocabulary player, a familiar example can also make the listening task more manageable when you have only part of your attention available.

Try recalling put off from its meaning before the answer plays, rather than only repeating the sentence after hearing it.

That adds retrieval practice to the repetition.

Next, meet the expression in a new situation

Once the original sentence feels reasonably comfortable, try another:

"I've been putting off my dentist appointment."

Or:

"They put off the trip because of the storm."

The meaning hasn't fundamentally changed. You're still talking about delaying something.

But the context, sentence structure, and grammatical form are different.

This is where you begin checking whether you understand the expression itself, rather than only the sentence in which you first learned it.

Finally, try making your own sentence

Can you think of something you've been putting off?

Maybe:

"I've been putting off cleaning my desk."

Or:

"We shouldn't put off making a decision."

This is no longer just recognition. You're attempting to use the expression to communicate your own meaning.

And that introduces another important part of vocabulary learning: moving from understanding language to producing it.

These steps don't need to happen in one session, and they aren't a scientifically established four-stage formula.

They're simply a useful way to combine the familiarity of repetition with the flexibility that different contexts may support.

6. You don't need to change every vocabulary card

There's a practical problem with constantly changing example sentences.

If every review shows a completely new sentence, you may spend more time understanding the new context than practising the expression you originally wanted to learn.

This is especially relevant when you use short vocabulary cards during a commute, a walk, or a quiet break.

A stable word-and-example pair has advantages. You know what to expect, the sentence remains easy to follow, and you can concentrate on pronunciation or recall.

But keeping the original example doesn't mean you have to encounter the expression only in that example.

You can meet it again while reading an article, watching a video, listening to a conversation, or practising with an AI tutor.

You might also encounter it naturally in the example sentence of another vocabulary card.

For instance, after learning:

miss the bus

"I missed the bus this morning."

You might later come across:

"If we don't leave now, we'll miss the bus."

The expression returns without requiring a separate card devoted to a new example.

This kind of natural recycling can create additional encounters while keeping the learning material coherent.

There's no need to force every previously learned expression into every new sentence. Examples should remain natural and easy to understand.

The goal is useful repetition, not repetition at any cost.

7. What matters more than the number of examples?

It's tempting to look for a simple rule.

Repeat the same sentence three times. Then introduce two new ones. After a week, add another.

But vocabulary learning doesn't work according to one universal formula.

A familiar everyday expression may require less explanation than an abstract verb or an idiom. A beginner may need more support from a consistent example than an advanced learner. And recognizing a word in a sentence is different from producing it in conversation.

Instead of counting example sentences, ask yourself a few more useful questions:

  • Do I understand the expression? If not, keep the examples simple and clear.
  • Can I remember it without seeing the original sentence? If not, practise recalling it.
  • Can I recognize it in a different situation? If not, look for another natural example.
  • Can I use it myself? If not, try a sentence that relates to your own experience.

You don't need to turn every vocabulary review into a test.

But these questions help you notice whether your knowledge is becoming more flexible.

The best approach isn't repetition or variety. It's knowing what each is for.

So, should you repeat the same example sentence or try different ones?

There's good reason to use both.

Familiar examples can make new vocabulary easier to approach and practise. Different examples can help you understand how that vocabulary works beyond its original context.

The research doesn't establish that every learner should follow the same sequence, and more variety isn't automatically better.

What matters is that you're not confusing a familiar sentence with complete knowledge of the expression inside it.

This is one reason vocabulary learning can benefit from combining different activities.

In Vocafy, a Voca set can give you a consistent starting point: an expression, its meaning, and a short example you can see and hear. You can return to that same material when you want to review or practise recalling it.

Then, as you encounter the expression in articles, videos, conversations, or other learning activities, you have opportunities to build on that original knowledge.

The example sentence doesn't have to change every time for your understanding to grow.

A familiar example gives you something to build on. New contexts give you more places to use what you've learned.

And together, they can help turn a sentence you remember into language you actually know.