1. 前肯后否,前否后肯
2. 反意疑问句中问句部分的动词与陈述部分的动词种类要对应一致(时态也需一致)
He has supper at home last night. dose’t he?陈述句部分是实意动词,那么 疑问句部分要用助动词代替实义动词
she has known already.has’t she? 陈述句动词是有助动词+实义动词构成,那么疑问句用一个助动词代替.
You can fly.can’t you ? 陈述句部分是情态动词,疑问句部分也一定要用情态动词.
You are a teacher. Aren’t you ?陈述句部分是BE动词,疑问句部分也要用BE动词
3. 句中有否定意义的词语时，反问时用陈述语气
She never breaks a bowl.does she?
4. 陈述部分的主语为不定代词something, anything, nothing, everything时，问句部分的主语用it
Nothing has happen to him. Has it?
Something is wrong with the computer, isn’t it
5. somebody(someone),anybody(anyone),nobody(noone),everybody(everyone)时，问句部分的主语用he或 they，这时问句动词的数应和he或 they一致
Someone has taken the seat,hasn’t he?
Everyone has done their best to overcome the issue.haven’t they?
6. 祈使句的陈述句有三种反问法 will you请你/would you请您/won’t you好吗？
（语气自己好好体会体会）
Please open the door. will you/would you/ won’t you?
7. 祈使句的否定句一般只用will you?
Don,t tell anybody. Will you ?
8.陈述部分为Let me……时，问句部分习惯上用shall I? 或will you?形式。如：
Let me introduce myself. Shall i(will you)
*9.陈述部分为Let us……时，问句部分习惯上用will you?形式。
Let us stop doing this , will you?
*10.陈述部分为Let’s……时，问句部分习惯上用shall we?形式。如：Let’s go home together, shall we?
Let’s go swimming. Shall we?
11.当使用must表示必须、命令的时候,用mustn’t
You must study hard next term. Mustn’t you ?
12.当使用must表示推测的时候,要根据陈述句的动词形式来
You must be joking.are’t you ?
*You must have made a mistake.haven’t you?
You must have seen the film last night.mustn’t you ?(有了明确过去时间，用mustn’t you)
13.感叹句后一定跟的是否定形式
What a lovely day.isn’t it？
14.用wish表示愿望时,用may i
I wish to get a red package from you. May i ?
*9.Let's是Let us的缩写。包括说话人和听话人双方在内，含有催促、建议或请对方一起行动的意思。在听话人表示赞同建议时可只用Let's.如：
---Shall we go by train？
---Yes，let's go.
*10.当请求对方允许自己（第一人称复数）做某事时，要用Let us，这里的 us 不包括听话对方在内，不能缩写为Let's.
如两个同学对老师说：
Please let us remove the bookshelf for you.
让我俩给你移动一下书架。
*12
Should have done 本应该做某事
Needn’t hace done 本没有必要做某事
must have done 过去一定做过某事
Can/could have done 本可以做某事
May/might have done 本可能做过某事
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