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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
you are fast
Grammar usage guide and real-world examplesUSAGE SUMMARY
This is correct and can be used in written English.
For example, "You are fast — I can always count on you to finish a job quickly."
✓ Grammatically correct
News & Media
Wiki
Alternative expressions(2)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
24 human-written examples
Most of the corners where you are fast, it comes naturally.
News & Media
You are fast losing the confidence of pupils, and of parents and of teachers".
News & Media
To dig deep on the hills, to be unafraid: it matters not that you are fast or slow.
News & Media
It seems, in wheelchair racing, that if you are fast, you can be fast over all distances.
News & Media
At one point, you can save a friend from being assimilated by the Borg hordes if you are fast enough.
News & Media
Except, expensive art is now a pretty sure sign that you are fast, loose, and overblown, if not corrupt.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
36 human-written examples
Photograph: PAUL MILLER/AAPIMAGE 1.14am BST Still more questions: If you are fast-tracking people for refugee assessments how can you be confident mistakes won't be made?
News & Media
"The downside is it takes away some of the flexibility, so because you are fast-tracking, if for some reason life situations change, it is a little bit hard to get off that track," Sargis says.
Science & Research
Notify others that you are fasting.
Wiki
Do not try this when you are fasting.
Wiki
Chase your opponents when you are faster than them!
Wiki
Expert writing Tips
Best practice
When using the phrase "you are fast", ensure the context is clear to avoid ambiguity. Specify the area where the person is fast, such as "You are fast at learning" or "You are fast on the track".
Common error
Avoid using "you are fast" in situations where speed is not a positive attribute. For example, telling someone "you are fast" after they made a hasty decision could imply impulsiveness rather than efficiency. Consider the connotations carefully.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "you are fast" functions primarily as a compliment or acknowledgment of someone's speed or efficiency. As indicated by Ludwig AI, this phrase is grammatically correct and readily understood. The examples show it used in various contexts, from praising someone's quickness to acknowledging rapid actions.
Frequent in
News & Media
37%
Wiki
35%
Science
28%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "you are fast" is a common and grammatically sound way to acknowledge someone's speed or efficiency. Ludwig AI confirms its correctness and provides numerous real-world examples showing its versatility across different contexts, particularly in news and media and on wikis. While its register is generally neutral, it leans towards informal, making it suitable for everyday conversation. When using the phrase, it's important to consider the context to ensure it conveys the intended meaning. Alternatives like "you are quick" or "you are speedy" can also be used to express a similar sentiment.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
you are quick
This alternative uses a synonym for "fast", emphasizing a similar attribute of speed.
you are speedy
This alternative uses a synonym for "fast", conveying the idea of rapid movement or action.
you are rapid
This alternative highlights the high rate at which someone performs actions.
you are swift
This alternative suggests a graceful and quick manner of movement or action.
you are efficient
This alternative focuses on the ability to accomplish tasks quickly and without wasting resources.
you are prompt
This alternative emphasizes the ability to do something without delay.
you are like a shot
This alternative uses a simile to describe extreme speed, comparing it to a projectile.
you are lightning fast
This alternative uses a simile, comparing speed to lightning.
you are a fast worker
This alternative specifies that the person is quick in a work environment.
you operate swiftly
This alternative suggests that someone acts quickly and effectively.
FAQs
What can I say instead of "you are fast"?
You can use alternatives like "you are quick", "you are speedy", or "you are efficient" depending on the context.
How to use "you are fast" in a sentence?
You can use "you are fast" to praise someone's speed, for instance, "You are fast! You finished the project in record time". It can also be used in more casual conversations, such as, "Wow, you are fast at replying to texts!"
Which is correct, "you are fast" or "you're fast"?
Both "you are fast" and "you're fast" are correct. The latter is a contraction of the former and is more informal.
What's the difference between "you are fast" and "you are faster"?
"You are fast" is a general statement about someone's speed. "You are faster" implies a comparison, meaning you are quicker than someone or something else.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested