I don't think he can finish the work, can he?　　　　　　　

I guess she taught herself Japanese, didn't she?

4．以Let us或Let me开头的祈使句，附加句用will you。如：

Let us help you, will you?

Let me do it for you, will you? (或may I?)

3．以Let's开头的祈使句，附加问句用shall we。如：Let's have a meeting, shall we?

2．否定的祈使句，附加问句一般用will you。如：

Don't play with the cat, will you？

1．以行为动词开头的祈使句，附加问句用will you 或won't you，有时也用would you, can you等。如

Give me a hand, will you?

4．当must表示“禁止”时，附加问句用must。如：

You mustn't do that again, must you?

3．当must表示“必须”时，附加问句用needn't。如：

You must see the doctor, needn't you?

2．当must表示“应该“时，附加问句用mustn't。如：

We must work hard at Chinese, mustn't we?

1．当must表示推测时，附加问句不用must，而是用must后面相呼应的助动词形式。如：

You must be very hungry, aren't you?

You'd better have a rest, hadn't you?

He'd like to go, wouldn't he?