[Grammar] Let me know when she comes in.

[sky3120]

1) Let me know when she comes in.

2) Let me know, when she comes in.

Can I say the sentences and "when clause" can be an adverbial clause and an object like above? And there must

be some difference between them in meaning. Or only #1 is grammatically correct? What do you think? Thank you

as usual and have a good day.

 

[bhaisahab]

1) Let me know when she comes in.

2) Let me know, when she comes in.

Can I say the sentences and "when clause" can be an adverbial clause and an object like above? And there must

be some difference between them in meaning. Or only #1 is grammatically correct? What do you think? Thank you

as usual and have a good day.

Only #1 is natural.

 

[Raymott]

1) Let me know when she comes in.

2) Let me know, when she comes in.

Can I say the sentences and "when clause" can be an adverbial clause and an object like above? And there must

be some difference between them in meaning. Or only #1 is grammatically correct? What do you think? Thank you

as usual and have a good day.

For 2, you can write "When she comes in, let me know."
1 can be ambiguous. "Let me know as soon as she comes in", or "Let me know sometime what time she comes in."
Actually 2 can be ambiguous as well. The context will tell.

 

[Barb_D]

I hadn't realized the potential ambiguity of the sentence until Ray pointed it out.

Mary has been late to work every day this week. I bet she'll be late today.
Okay - let me me know when (= what time) she comes in.

I forgot to ask Mary yesterday about whether she'll be joining us for lunch, but she'll be here any moment and I'll ask her again.
Okay - let me know (whether she will be joining us) when she comes in (because then you'll be able to ask her.