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Ngữ pháp
Sentence structure A1 A2 B1

It as a subject

Use it for time, weather, distance, opinions, and delayed subjects.

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It as a subject: fill the front slot

English wants a subject at the front
(subject = the first who/what place)

No real person or thing to put there?
              ↓
            use It
              ↓
[ It ] + [ situation frame ] + [ real details ]

weather      → It's raining.
time         → It's five o'clock.
opinion      → It's easy to get lost here.
time needed  → It takes about twenty minutes to walk there.

It here = subject filler, not a thing.

Use it to fill English’s required subject place when the sentence is about a situation, or when the real idea comes later.

Introduction

Why English uses it here

English usually needs an expressed subject. When there is no real person or thing doing the action, we often use it as an empty or situation subject. It lets the sentence talk naturally about time, weather, distance, or a whole situation: “It's Monday.” “It's raining.” “It's ten minutes to the station.” In these sentences, it does not name an object. It simply fills the subject position so the important information can come after the verb.
Core Ngữ pháp A1 Từ vựng A1 Neutral

It's Monday.

Use it as the required subject when giving the day.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's Monday
time/date subject frame
A complete frame for saying the day or date with dummy it.
Học như một cụm cố định
Core Ngữ pháp A1 Từ vựng A1 Neutral

It's raining.

The it does not refer to a thing; it fills the subject position for weather.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's raining
weather frame
A common weather sentence with it as the subject.
Học như một cụm cố định
Core Ngữ pháp A1 Từ vựng A1 Neutral

It's ten minutes to the station.

Use it to introduce a distance or travel-time estimate.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's ten minutes
distance/time estimate frame
A reusable start for distance or travel-time estimates.
Học như một cụm cố định
to the station
destination phrase
Shows the endpoint of the distance or journey.
Core logic

It fills the subject slot

The core logic is: put it in the subject place, then say what is true about the situation. With be, the pattern is it + be + description: “It's five o'clock.” With weather verbs, the pattern is it + weather verb: “It rained all night.” This it does not answer “who?” or “what thing?” It is a grammatical subject, not a meaningful noun. The real message is usually the time, weather, distance, condition, or opinion after the verb.
Core Ngữ pháp A1 Từ vựng A1 Neutral

It's five o'clock.

Time expressions commonly use it as the subject.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's five o'clock
clock-time frame
A complete frame for saying the time.
Học như một cụm cố định
Core Ngữ pháp A2 Từ vựng A1 Neutral

It rained all night.

Weather verbs also need it as the subject.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It rained
weather verb frame
A reusable weather-verb pattern with it as subject.
Học như một cụm cố định
all night
time phrase
Says when or how long the weather happened.
Core pattern

Time, weather, and distance frames

For time, dates, weather, and distance, the frame is highly reusable. Use it with clock time, days, general weather adjectives, weather verbs, and distance expressions. In questions with be, move be before it: “Is it cold outside?” For distance, keep it at the start: “It's a long way to the airport.” With weather verbs in simple tenses, use do-support in questions: “Did it rain?” The subject it stays even when the real topic feels obvious from context.
Question Ngữ pháp A1 Từ vựng A1 Neutral

Is it cold outside?

In questions with be, put be before it.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

Is it cold
weather question frame
A reusable question frame with be before it.
Học như một cụm cố định
outside
place phrase
Adds the place or situation.
Core Ngữ pháp A1 Từ vựng A2 Neutral

It's a long way to the airport.

Use it with distance descriptions such as a long way.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's a long way
distance frame
A natural frame for saying that a place is far.
Học như một cụm cố định
to the airport
destination phrase
Names the destination.
Question Ngữ pháp A2 Từ vựng A1 Neutral

Did it rain?

With simple-tense weather verbs, use do-support in questions.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

Did it rain
weather question with do
A reusable past simple question frame for a weather verb.
Học như một cụm cố định
Core pattern

Opinions and delayed subjects

It also helps when the real subject is long, especially an action or a whole clause. Instead of starting with the long idea, English often starts with it and places the long idea later. Use it + be + adjective + to action: “It's easy to get lost here.” Add for + person when the opinion applies to someone: “It's important for us to be on time.” Use it + be + adjective/noun + that clause for a full idea: “It's clear that she needs help.” “It's a shame that the shop is closed.”
Core Ngữ pháp A2 Từ vựng A2 Neutral

It's easy to get lost here.

The real action comes later as a to-infinitive.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's easy
evaluation frame
A reusable opinion/evaluation frame with dummy it.
Học như một cụm cố định
to get lost here
delayed action
Names the action being evaluated.
Core Ngữ pháp A2 Từ vựng A2 Neutral

It's important for us to be on time.

For + person can show who needs to do the delayed action.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's important for us
evaluation plus affected person
A reusable frame for saying who the evaluation concerns.
Học như một cụm cố định
to be on time
delayed action
Names the action that is important.
Core Ngữ pháp B1 Từ vựng A2 Neutral

It's clear that she needs help.

It can delay a full that-clause until after the adjective.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's clear that
that-clause evaluation frame
A reusable frame for introducing a clear fact or conclusion.
Học như một cụm cố định
she needs help
delayed clause
Gives the full idea after that.
Spoken Ngữ pháp B1 Từ vựng A2 Neutral

It's a shame that the shop is closed.

A noun phrase such as a shame can also evaluate a delayed that-clause.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's a shame that
noun evaluation frame
A reusable frame for reacting to a situation.
Học như một cụm cố định
the shop is closed
delayed clause
Names the situation being judged.
Sentence xray

X-ray: it takes + time

In “It takes about twenty minutes to walk there,” the word it fills the subject position. The verb takes connects the situation with a time amount. About twenty minutes is the amount, and to walk there is the delayed action. The reusable frame is it takes + time + to action. In questions, use do-support because take is an ordinary verb: “Does it take long to get there?” This pattern is common for journeys, tasks, forms, phone calls, and everyday plans.
Core Ngữ pháp A2 Từ vựng A1 Neutral

It takes about twenty minutes to walk there.

It takes + time + to-infinitive is a key frame for duration.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It takes
duration frame
The core frame for saying how much time an action needs.
Học như một cụm cố định
about twenty minutes
time amount
Says the amount of time.
to walk there
delayed action
Names the action that takes time.
Question Ngữ pháp A2 Từ vựng A1 Neutral

Does it take long to get there?

Use does with take in present simple questions.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

Does it take long
duration question frame
A reusable question frame for asking about duration.
Học như một cụm cố định
to get there
delayed action
Names the action or journey.
Contrast

It is not there is

The closest confusion is it versus there. Use there is or there are to introduce the existence or presence of something: “There's a café near the station.” Use it when the thing is already known and you are describing it: “It's near the station.” If you say “It is a café near the station” to mean that a café exists, the sentence sounds wrong because the thing has not been introduced. Also, do not use dummy it when a real subject is already present: say “The train is late,” not it is late the train.
Contrast Ngữ pháp A1 Từ vựng A2 Neutral

There's a café near the station.

Use there is, not dummy it, to introduce the existence of something.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

There's a café
existence frame
A reusable frame for introducing something that exists or is present.
Học như một cụm cố định
near the station
place phrase
Says where it is.
Contrast Ngữ pháp A1 Từ vựng A1 Neutral

It's near the station.

Here it refers back to a known café, so it is not an empty subject.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It's near the station
known-thing description
Use it when the thing is already known and you are describing it.
Học như một cụm cố định
Mistake Ngữ pháp A1 Từ vựng A2 Neutral

It is a café near the station.

This is a common error when the speaker wants to introduce that a café exists. Use there is instead.

Corrected Ngữ pháp A1 Từ vựng A1 Neutral

The train is late.

When there is a real subject, do not add dummy it.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

The train is late
real subject frame
Use the real noun as subject when you are describing that noun directly.
Học như một cụm cố định
Form variations

Questions, negatives, and tense

Make questions and negatives according to the verb. With be, put be before it in questions and put not after be in negatives: is it, was it, it is not, it was not. “It wasn't easy to cancel the booking.” With weather verbs and take, use do-support in simple tenses: did it rain, does it take, it did not rain. “It didn't take long.” It can also appear after modals: it may rain, it could be difficult. The subject it stays in the sentence.
Negative Ngữ pháp A2 Từ vựng A2 Neutral

It wasn't easy to cancel the booking.

With be, put not after the be form.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It wasn't easy
negative evaluation frame
A reusable negative frame with be + not.
Học như một cụm cố định
to cancel the booking
delayed action
Names the action being evaluated.
Negative Ngữ pháp A2 Từ vựng A1 Neutral

It didn't take long.

With take in the past simple, use didn't before the base verb take.

Các thành phần cấu tạo

Đọc câu theo từng cụm, không đọc từng từ.

It didn't take long
negative duration frame
A reusable negative frame with take and do-support.
Học như một cụm cố định
Summary

Key frames to remember

Use it as subject when the sentence talks about time, date, weather, distance, a general situation, an evaluation with a delayed action, a that-clause, or the time needed for an action. The main frames are it + be + time or description, it + weather verb, it + be + adjective or noun + to action, it + be + adjective or noun + that clause, and it takes + time + to action. Choose there is or there are instead when introducing something that exists or is present.
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