[Noun Clauses] Noun clauses with who, what, whose + BE

 black book Page 408

主要的是誰

1.

A: Who is that woman? (is: V that woman: S)

B: I don't know who that woman is.

2.

A: Who is on the phone?

B: I don't know who is on the phone.

3.

A: What is a crow?

B: I don't know what a crow is.

6.

A: Whose car is that?

B: I don't know whose car that is.

What 一律視為單數