I will let you know once I heard from them. vs I will let you know once I hear from them.

Both phrases are correct, but they are used in slightly different contexts. The first phrase 'i will let you know once i heard from them.' uses the past tense 'heard' which implies that the action of hearing from them has already happened. The second phrase 'i will let you know once i hear from them.' uses the present tense 'hear' which implies that the action of hearing from them is expected to happen in the future.

Last updated: March 30, 2024 • 6166 views

I will let you know once I heard from them.

This phrase is correct but implies that the action of hearing from them has already happened.

This phrase is used when you want to convey that you will inform someone after you have already heard from them in the past.

Examples:

I will let you know once I heard from them about the meeting details.

Show examples from the web [+]

And I will let you know when I'm ready to look at them.
As I say, I'll let you know once I've seen them this morning.
Thanks, I'll let you know once I made a decision, Nigel.
I'll let you know once I solve the case.
But I will let you know what he says.
I will let you know when it is finished.
Director J'onzz, I will let you know when I decide what those consequences will be.
If there is any cancellation, I will let you know.
I will let you know when you should reveal this exclusive information.
But I will let you know when you cracked the case.
So if someone calls for you, I will let you know.
I will let you know if I meet anyone innocent.
Not yet, but I will let you know.
I will let you know if their luck changes.
I will let you know when I have those results.
Will let you know once it's done
Well, then I will go tell Jessica and I will let you know the second Vanessa calls.
If it does, I will let you know.
I can keep an eye on her, and I will let you know how she's doing.
I need to take care of this, so I will let you know what I decide.

Alternatives:

I will let you know once I have heard from them.
I will let you know once I hear from them.
I will let you know once I have heard back from them.
I will let you know once I get a response from them.

I will let you know once I hear from them.

This phrase is correct and commonly used to indicate informing someone after you receive communication from them in the future.

This phrase is used when you want to convey that you will inform someone after you receive communication from them in the future.

Examples:

I will let you know once I hear from them about the project updates.

Show examples from the web [+]

And I will let you know when I'm ready to look at them.
When I hear from the athletic board I'll let you know.
When I hear from Jan Di, I'll let you know immediately.
If I hear from him, I'll let you know.
When I hear from the athletic board I'll let you know.
As I say, I'll let you know once I've seen them this morning.
Thanks, I'll let you know once I made a decision, Nigel.
I'll let you know once I solve the case.
But I will let you know what he says.
I will let you know when it is finished.
Director J'onzz, I will let you know when I decide what those consequences will be.
If there is any cancellation, I will let you know.
I will let you know when you should reveal this exclusive information.
But I will let you know when you cracked the case.
So if someone calls for you, I will let you know.
I will let you know if I meet anyone innocent.
Not yet, but I will let you know.
I will let you know if their luck changes.
I will let you know when I have those results.
Will let you know once it's done

Alternatives:

I will let you know once I have heard from them.
I will let you know once I heard from them.
I will let you know once I have heard back from them.
I will let you know once I get a response from them.

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I will let you know once I heard from them. vs I will let you know once I hear from them.