Who came to see you?

[piousoul]

Originally Posted by dihen

I think he is using "who" to mean "someone".
`
3. Do you think(now) someone came to see you(yesterday)?
Yes, I do think (now) someone came to see me.
`

Yes, that's the keypoint. Thanks, dihen.
Nevertheles, first, I still wonder why it makes sense when someone is substituted for who in the context.
Could someone help to explain?

Second, if I rewrite my base sentence as the following, does it make sense?

3a. Do you think "who came to see you"?

[Casiopea]

Originally Posted by piousoul

1. _______________ came to see you?

A. Who you think
B. Do you think who
C. Who do you think
D. Whom do you think

Which choice fits in the blank better, A, B, C, or D?
Thanks.

Question: Who do you think came to see you?
Answer: I think (that) he came to see me.

=> 'he' functions as a subject pronoun, so it's replaced by 'who', not 'whom'.

Replacement: I think who came to see me?
DO-insertion: do you think who came to see you?
WH-movement: Who do you think came to see you?

Hope that helps.

[Casiopea]

Originally Posted by piousoul

3. Do you think(now) who came to see you(yesterday)?
Yes, I do think (now) who came to see me.

What's your prized opinion?

Ah, yes. You're dealing with ellipsis. Let's follow riverkid's lead and switch the verb to see what's going on,

Ex: Do you know [the person] who came to see you? <grammatical>

The relative 'who came to see you' modifies an omitted noun phrase; e.g., 'the person'. The verb 'know' takes a noun phrase, whereas the verb 'think' takes a clause.

3. Do you think (that) SUBJECT+VERB

In short, you can't equate 'know who' with 'think (that) who'. They're different in structure.

As for why 'someone' works where 'who' won't, take a look,

Ex: Do you think (that) someone came to see you? <statement>
Ex: Do you think (that) who came to see you? <question within a question>

Hope that helps.

[trans]

I wonder who came to see me.

[queenbu]

You could say 'Do you think about who came to see you yesterday?'

[trans]

Originally Posted by queenbu

You could say 'Do you think about who came to see you yesterday?'

Are you sure? Or just kidding? Wouldn't it be here:
"Do you think about the one who came to see you yesterday?"

[piousoul]

Originally Posted by Casiopea

As for why 'someone' works where 'who' won't, take a look,

Ex: Do you think (that) someone came to see you? <statement>
Ex: Do you think (that) who came to see you? <question within a question>

Hope that helps.

Casiopea, thank you for taking trouble to clarify it for me.

I want to make sure that you mean the line in bold sounds odd and doesn't make sense, right?
Nevertheless, it makes sense in terms of my mother tongue though the situation it refers to is rare.

If I put about after think, would it sound better?

Do you think about who came to see you? OR,

Are you thinking about who came to see you?

Does it sound right?

[trans]

Originally Posted by trans

I wonder who came to see me.

I'm for serious. This must be correct. Doesn't work with "think" though.

[queenbu]

Originally Posted by piousoul

Casiopea, thank you for taking trouble to clarify it for me.

I want to make sure that you mean the line in bold sounds odd and doesn't make sense, right?
Nevertheless, it makes sense in terms of my mother tongue though the situation it refers to is rare.

If I put about after think, would it sound better?

Do you think about who came to see you? OR,

Are you thinking about who came to see you?

Does it sound right?

I was going to suggest 'Are you thinking about who came to see you?' but the other form also sounds ok. And, no, trans, I'm not kidding! Why should I be?

[piousoul]

Originally Posted by trans

I'm for serious. This must be correct. Doesn't work with "think" though.

Thanks, trans, for your concern, and I'm sure the following are all right.

I wander/know/understand who came to see me.

But, my base quetion is a test question, and I want to make certain that it's right.