confirm by

USAGE SUMMARY

The phrase "confirm by" is correct and can be used in written English.
You can use it when you want to confirm something with a certain date or deadline, as in "Please confirm by Friday the 13th that you will be attending the meeting."

✓ Grammatically correct

News & Media

Science

Wiki

Human-verified examples from authoritative sources

Exact Expressions

59 human-written examples

They are four-sided and easy to confirm by rolling them between your fingers.

The New York Times

I would ask you to confirm, by saying "yes" or "no," whether you think that chart is correct.

Yale University

Here we confirm by mutation the inputs into the blimp1 cis-regulatory module predicted by network analysis.

Developmental Biology

Under stock market rules, Zurich must now confirm by 5pm on 25 August whether it will make a formal offer for RSA.

The Guardian - Business

BBC sources said they had been asked to confirm by today whether they were taking part, but both failed to do so.

The Guardian

But, with many members of the mission dead, seriously injured or traumatized and scattered, officials were unable to confirm by this evening that an offer had been made.

The New York Times

Moreover, we were able to confirm by PCR and DNA sequencing 4 new intragenic Alu elements, polymorphic in 10 additional individuals.

Genomics

Mr. Keeb is supposed to present a list of candidates on Sunday for the governing Transitional National Council to confirm by Tuesday, after weeks of delays.

The New York Times

The Pillar House, which is adjacent to the castle gate, has been booked for a week -- though its rooms are empty -- although Ms. McKenna did not confirm by whom.

The New York Times - Style

Using photos of Mars that have already been studied by a geologist, volunteers are asked to click on areas that look like craters to confirm, by consensus, their locations and outlines.

The New York Times - Tech

Human-verified similar examples from authoritative sources

Similar Expressions

1 human-written examples

Unfortunately, orthology is difficult to confirm by experimental methods.

BMC Plant Biology

Expert writing Tips

Best practice

When using "confirm by", always specify a clear deadline or timeframe to ensure the request is actionable and understood. For example, "Please confirm by the end of the day" is more effective than simply saying "Please confirm".

Common error

Avoid using "confirm by" without a specific date or time. Saying "Please confirm by" without a deadline leaves the request vague and may lead to delays. Always include a clear timeframe, such as "Please confirm by Friday at 5 PM."

Linguistic Context

The phrase "confirm by" functions as a directive prepositional phrase, typically used to request or instruct someone to verify or acknowledge something within a specified timeframe. As Ludwig AI indicates, this phrase is considered grammatically correct and commonly used. Examples from Ludwig show its use in setting deadlines for responses or actions.

Expression frequency: Very common

Frequent in

News & Media

33%

Science

32%

Wiki

10%

Less common in

Academia

8%

Formal & Business

7%

Reference

0%

Ludwig's WRAP-UP

The phrase "confirm by" is a commonly used and grammatically sound prepositional phrase employed to request verification or acknowledgment before a specified deadline. According to Ludwig AI, it's deemed correct and finds frequent application across various domains, particularly in news, science, and general writing. Effective use involves clearly stating the timeframe for confirmation, preventing ambiguity. Ludwig examples show it serves to elicit timely responses, establishing clear expectations. Its neutral register renders it suitable for a broad range of professional and informal contexts.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

verify before

Changes the focus from a deadline to a point in time before which verification must occur; less deadline-oriented.

validate until

Specifies a validation process with an end date rather than a confirmation deadline.

ratify by

Implies formal approval by a specific date; more formal and specific than "confirm".

authenticate before

Focuses on proving genuineness ahead of a particular time, not just confirmation.

affirm no later than

Uses a more formal tone and specifies a latest possible date for affirmation.

assent by

Indicates agreement or acceptance must be given by a certain date.

establish by

Focuses on setting something as a fact before a certain time.

substantiate by

Emphasizes providing evidence by a deadline; more about proving than simple confirmation.

determine before

Highlights making a decision before a particular time, rather than just confirming.

ascertain by

Stresses the act of finding something out for certain, to be done by a particular date.

FAQs

How do I use "confirm by" in a sentence?

Use "confirm by" to request verification or acknowledgement of something before a specific date or time. For example, "Please confirm by tomorrow if you can attend the meeting."

What can I say instead of "confirm by"?

You can use alternatives like "verify before", "validate until", or "ratify by" depending on the context.

Is it better to say "confirm by [date]" or "confirm before [date]"?

"Confirm by [date]" indicates a deadline, whereas "confirm before [date]" suggests any time leading up to that date is acceptable. The choice depends on whether you need a response by a specific deadline or simply before a certain date.

What's the difference between "confirm by" and "confirmed by"?

"Confirm by" is a request for someone to verify something before a deadline. "Confirmed by" indicates that something has already been verified by someone or something, such as "The results were confirmed by the lab tests."