She is fixing the printer.
The continuous form is natural because fixing is an action happening now.
Building blocks
Read the sentence in chunks, not word-by-word.
Decide when verbs describe states or actions so continuous and perfect forms sound natural.
Meaning first: what is the verb doing here?
[verb in this sentence]
│
┌──────────────┴──────────────┐
▼ ▼
PHOTO = STATE VIDEO = ACTION
true / exists / feels doing / happening
not an activity activity in progress
│ │
simple form be + -ing = in progress
She owns the printer. She is fixing the printer.
Past → now state Past → now action
have + state have been + -ing
I’ve known Sam for years. I’ve been waiting for Sam for an hour.
Same word? Choose the meaning again:
The room smells clean. → PHOTO
The dog is smelling my bag. → VIDEO
Ask: is this verb a photo (state) or a video (action)? Use continuous forms for the video meaning.
She is fixing the printer.
The continuous form is natural because fixing is an action happening now.
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She owns the printer.
Own describes a state, so the simple form is natural.
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I need a break.
Need is normally stative, so it uses the simple present.
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Do you believe him?
Believe is a mental-state verb, so the simple question form is normal.
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She doesn’t like coffee.
Like describes a preference, so the simple present is natural.
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Right now, I’m taking a break.
Take a break is an activity here, so the continuous form is natural.
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The room smells clean.
Smells describes a perceived state of the room.
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The dog is smelling my bag.
Here smell is an action: the dog is actively using its nose.
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I’ve known Sam for years.
Know is a state verb, so present perfect simple is the natural perfect form.
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We’ve owned this flat since 2018.
Own is a state verb, so present perfect simple is preferred for duration.
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I’ve been waiting for Sam for an hour.
Waiting is an activity, so present perfect continuous is natural.
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They’ve been repairing the flat since May.
Repairing is an action over time, so the continuous perfect form sounds natural.
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I think you’re right.
Think is stative when it means believe or have an opinion.
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I’m thinking about changing jobs.
The continuous is natural because think means consider here.
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He has a small office.
Have is stative when it means possess.
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He’s having a meeting.
Have can be continuous when it means experience or take part in an activity.
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I’m knowing the answer.
Know is a state verb here, so the continuous form is normally wrong.
I know the answer.
Use simple present for the state verb know.
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Are you understanding me?
Understand is a mental-state verb here, so the continuous question sounds unnatural in neutral English.
Do you understand me?
Use the simple present question for understand when asking about comprehension.
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