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She runs fast. vs She is running fast.

Both sentences are correct, but they are written in different tenses. 'She runs fast.' is a simple present tense statement, while 'She is running fast.' is in the present continuous tense. The choice between them depends on whether you want to emphasize the ongoing action or just state a fact.

Explained by Vince
Editor at TextRanch

Last updated: August 22, 2024

She runs fast.

This phrase is correct and commonly used in English.

This phrase is in the simple present tense and is used to state a fact about someone's ability to run fast.

Examples:

She runs fast in every race she participates in.
He runs fast, but she runs even faster.
The cheetah runs fast to catch its prey.
My dog runs fast when he sees a squirrel.
The athlete runs fast to reach the finish line.

Show examples from the web [+]

So you want me because I can run fast.
Women and money, they run fast.
I have a dog which can run fast.
John is too fat to run fast.
I should have a though male assistant who runs fast.
Mr Mussabini I can run fast.
That's the sound I make when I'm trying to run fast.
I never tried hard in school 'cause I could always run fast.
Your second toe is bigger than the others... ...that means you run fast.
We have to run, run, run fast.
For all we know, she can walk, if not run, really fast.
You said if I run fast enough.
I couldn't run fast enough.
The only reason you and I in this country is 'cause our great-great-grandpas couldn't run fast enough.
I don't know if you can run that fast.
Because he couldn't run very fast.
I never thought I'd ever see you run that fast.
I didn't know you could run so fast.
I can't run that fast.
At the surface the clock runs very fast.

Alternatives:

She is a fast runner.
She can run fast.
She runs quickly.
She is quick on her feet.
She has a fast pace.

She is running fast.

This phrase is correct and commonly used in English.

This phrase is in the present continuous tense and is used to describe an ongoing action of running fast.

Examples:

She is running fast to catch the bus.
He is running fast because he is late.
The children are running fast in the playground.
The marathon runner is running fast to break the record.
She is running fast to keep up with the others.

Show examples from the web [+]

He came out the door, running fast.
I saw a man run away, running fast.
Anyhow, once you've given it to him, start running fast.
Montag is still at large, but time is running out fast.
Tobey's been running again, and running fast.
But at her age in high def, she was running out of buttons fast.
This watch has been running fast for years.
I'm starting to understand why Maggie was running so fast.
Your options are running out fast.
He's running pretty fast. I think he did.
Slow that drip down. It's running too fast.
He's running pretty fast. I think he did.
The fires have spread, the power supply is dwindling, and our food and water are running out fast.
I'm applying a timeline and running it fast forward.
The future is running fast to meet us and we still have no clear analysis of the impact of EMU on our regions.
Joe Dooley knew his days pounding the beat on the Golden Mile were fast running out.
Just make sure you get that room up and running as fast as possible.
But she is running a charity and is therefore subject to stricter zoning ordinances.
I believe she is running a small hotel up north.
- She is running on backup power now...

Alternatives:

She is a fast runner.
She can run fast.
She runs quickly.
She is quick on her feet.
She has a fast pace.

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