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if they don't vs if they didn't

The phrases "if they don't" and "if they didn't" have different meanings and are used in different contexts. "If they don't" is used to talk about a future possibility or condition, while "if they didn't" is used to talk about a past possibility or condition. Therefore, they are not directly comparable as they serve different purposes.

Last updated: March 20, 2024 • 3925 views

if they don't

This phrase is correct and commonly used in English to talk about a future possibility or condition.

This phrase is used to express a condition or possibility that may happen in the future. It is often followed by a consequence or result.

Examples:

If they don't arrive on time, we will have to start without them.
I will be disappointed if they don't keep their promise.
If they don't pass the exam, they will have to retake it.
What will happen if they don't agree to the terms?
If they don't finish the project by Friday, we will be in trouble.

Show examples from the web [+]

Can the Dolphins ground game excel if they don't re-sign Lamar Miller? February 3, 2016 | Filed in: 2016 Offseason. Comments 1. Dolphins running back Lamar ...
Flint Residents Told That Their Children Could Be Taken Away If They Don't Pay For City's Poison Water. By John Vibes on January 24, 2016. Not only is the ...
If they don't come for me (It's all over) If they don't come for me (We're gonna die) If they don't stop the sickness inside me at least I've got you by my side [x2]
May 13, 2015 ... 10 Sweet, Little Things You Do That Men Notice Even If They Don't Say It ... 10 Sweet, Little Things You Do That Men Notice Even If They Don't ...

Alternatives:

if they fail to
unless they do
in case they do not
if they do not
should they not

if they didn't

This phrase is correct and commonly used in English to talk about a past possibility or condition.

This phrase is used to express a condition or possibility that may have happened in the past. It is often followed by a consequence or result.

Examples:

If they didn't receive the invitation, they wouldn't know about the party.
I would have been surprised if they didn't win the competition.
If they didn't study, they probably failed the test.
What would have happened if they didn't intervene?
If they didn't leave early, they would have missed the train.

Show examples from the web [+]

Golden Globes: Who Really Won (Even if They Didn't). Awards | By Tim Kenneally on January 10, 2016 @ 9:07 pm. Email Print. rachel bloom golden globes.
Jan 5, 2016 ... Making a Murderer: Steven Avery jurors 'feared for their personal safety' if they didn't convict subject of Netflix series, filmmakers say. One of the ...
Doing the Right Thing: Taking Care of Your Elderly Parents, Even If They Didn't Take Care of You Paperback – March 16, 2006. by Roberta Satow. Ph.d (Author).
Jan 5, 2016 ... Jurors 'feared for their personal safety' if they didn't convict. (self. MakingaMurderer). submitted 27 days ago by Mickee77. From NBC Today ...

Alternatives:

if they hadn't
had they not
unless they had
in case they did not
if they did not

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