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?