I'll let you know where she lives.

--> As I know of, 'where she lives' is an object for 'know' in this sentence.

I'll let you know when she arrives.

-->But in this, 'when she lives' seems adverb. Then, can't it be understood as an object for 'know' like the 'where' clause in the first sentence?

If so, how can I express if I want to say 'I'll let you know the time when she arrives"?
Regular Member507
The verb is "let someone know."
To eliminate confusion:
I'll let you know that when she arrives.
I'll let you know the time when she arrives.
Veteran Member11,673
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I'll let you know as soon as she arrives.
I'll let you know the time of her arrival.
CJ
Veteran Member53,446
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Marius Hancu
I'll let you know that when she arrives.

I'll let you know the time when she arrives.

Hi Marius Hancu,

What is 'that' referring to in the first sentence?

Thanks

PBF
Senior Member2,142
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Marius Hancu
I'll let you know that when she arrives.

I'll let you know the time when she arrives.

Hi Marius Hancu,

What is 'that' referring to in the first sentence?

Thanks

PBF
Trusted Users: Trusted users are allowed to use additional capabilities of the site such as private messaging to all users and various other advanced features. You cannot join this role unless you are promoted by an administrator.
<> You may like a comma there:
<> I'll let you know that, when she arrives.
Proficient Speaker: Users in this role are known to maintain an excellent grasp of the English language. You can only be promoted to this role by the Englishforums team.
Thanks for all of your answers.
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