以Let's(听者包括在内)开头的祈使句,前肯后可肯可否,疑问句必须用shall we(shall只用于第一人称);只有以Let us(听话人不被包括在“us”里面)或Let me开头的祈使句,问句才用will you.
Let us know the time of your arrival,will you?
Let's try again,shall we?
Let me help you,will you?
Let’s have a look on your book,shall we?