5

Which sentence should I use?

I'll let you know when I have more information.

I'll let you know when I'll have more information.

Also, what is the proper grammatical explanation for the correct version?

2
  • 2
    "I will let you know when I have more information." is correct. You don't use the future tense in an adverbial clause.
    – JayHook
    Jul 30 '13 at 11:55
  • I think this question has been already asked.
    – apaderno
    Jul 31 '13 at 0:25
7

Both can be correct, but I would expect that the first version is the one that you would actually want most of the time.

In the first version, "I'll let you know when I have more information", there are two time points. At time T (now) you don't have more information. You are promising that at some time T+1, you will have more information, and at that same time T+1 you will inform them of this information.

In the second version, "I'll let you know when I will have more information", there are three time points. At time T (now) you don't have more information. At some time (T+1) you will have a schedule. This schedule gives a time (T+2) at which you will have more information. You are promising that at time (T+1), when you have the schedule, you will inform them of the schedule.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .