Question

Do you know Who he is?能不能是Who do you know he is?.

1.Do you know Who he is?能不能是Who do you know he is?

2.what do you think it is?能不能是Do you think what it is?

WHY?

Answer 1

可以的，两句的DO you know 都是插入语
插入语既可以放在句前，也可以放在句中
类似的还有do you think

关于插入语，可以分为下面一些
1. 用简短的句子结构作插入语。这类短语有:I think, I hope, I guess, I believe, I suppose, I wonder, I tell you, I say, I'm afraid, I'm sure, you see, you know, as you know, that is, that is to say, what's more等等,它们可以置于句中或句尾。如:

I suggest you choose someone who you think is kind and friendly.

This diet, I think, will do good to your health.

It won't be raining long, I hope.

You will have to work harder, you know, if you want to succeed.

2. 副词或副词短语用作插入语,这类插入语一般放在句首或句尾。如:

Happily for him, his father's second wife was kind to him too.

You'll be able to pass the coming exam, surely.

Luckily for him, he didn't hurt in the accident.

Honestly, I don't need it at the moment.

3. 介词或介词短语作插入语,这类插入语一般放在句首,有时也可放在句中。如:

Like most of my schoolmates, I have neither brothers nor sisters-in other words, I'm an only child.

By the way, Bob sends his best wishes.

On the other hand, I didn't know you were there.

In short, things have begun to improve since schools were called on to reduce learning load.

4. 分词短语作插入语。如:

Judging from your accent, you must be from England.

Generally speaking, he is the best student in our class.

Compared with China, the USA is smaller.

5. 不定式短语作插入语。如:

To put it mildly, he was not up to the mark.

To tell you the truth, I don't want to see her.

To be sure, Jim is a faster skater, but he is not good at doing figures.

To conclude, it was a great success.

Answer 2

1可以
2不可以
do you know在句中可以作为插入语，在1中，Do you know who he is/Who(do you know)he is意思一致
但2不可以，因为Do you think what it is的语法是错误的．

Answer 3

可以的，DO YOU KNOW 是插入语

Answer 4

不可以
这是语法规定的