About interrogative sentences

Hi,

We usually say:
"Do you know who you are?" No, we don't usually say this. It sounds rather odd. It sounds like a doctor talking to someone who has suffered a head injury.
"Who do you think you are?" Yes, this is commonly said, in cases where someone is doing things that are typical of another person. eg One of your friends starts giving you a lot of advi

Hi Clive,

Thanks for your explanation. But what I don't understand is, from a grammatical point of view, why we say:

"Do you know who he is?"
"Who do you think he is?"

rather than:

"Who do you know he is?"
"Do you think who he is?"

And by the way, which of the following sentence is standard?

"Who do you think is he going to invite hom

Hi Kevin,

Welcome to the Forum.

. . . what I don't understand is, from a grammatical point of view, why we say:

"Do you know who he is?"
"Who do you think he is?"

rather than:

"Who do you know he is?" As you can see, all you have changed is the verb. The reason this is not correct is that we usually don't use the verb 'kno

I see.

Grammar is supposed to help people learn a language, and never should it come before meanings, which are the part that counts.

To be frank, I am a bit surprised that your replies came in so quick.

I am sure to come back now and then to bother you with questions about English.

Thanks again!

"Do you know who he is?"
"Who do you think he is?"

The structures are as follows.

Indirect question derived from Who is he? embedded in the direct yes/no question Do you know?
(You know?) the answer to the question (who is he?). >
(Do you know) the answer to the question (who he is)? >
Do you know who he is? (Ye

Hi Jim,

Pretty amazing interpretation for some confusing fact to me!

Thanks a lot.