Chapter2. Penang-grammar
二十一、陳述部分用must(may, might) + have + v-ed表示推測時(shí)，若句中帶有明顯的過去時(shí)間的狀語，問句部分動詞用過去時(shí)形式。如：
①he might have forgotten his pen in the classroom yesterday, didn’t he?
(不用mightn’t he?/ hasn’t he?)
②you must have got up late this morning, didn’t you?(不用mustn’t you?/haven’t you?)
二十二、陳述部分用must(may, might) + have + v-ed表示推測時(shí)，若句中沒有帶明顯的過去時(shí)間的狀語，問句部分動詞用現(xiàn)在完成時(shí)形式。如：
①everyone must have known the death of the waitress, haven’t they? (不用mustn’t they?)
②you must have worked there a year ago, didn’t you?(不用mustn’t you?/ haven’t you?)
二十三、陳述部分的主語為從句時(shí)，問句部分的主語一般用it代替，如：
①what he said is true, isn't it? (不用didn’t he?)
②where we will build the dam has not been decided yet, has it? (不用won’t we?)
二十四、陳述部分的主語為動名詞或不定式時(shí)，問句的主語用it代替。如：
①to do one good deed is easy for a person, isn’t it?
②skating is your favorite sport, isn’t it?
[鏈接2]
說明：
反意疑問句的更多練習(xí)：
1. you’d rather watch tv this evening, ______?
a. isn’t it b. hadn’t you c. wouldn’t you d. won’t you
2. i suppose you’re not going today, ______?
a. are you b. do you c. don’t you d. aren’t you
3. i wish to shake hands with you, ______?
a. shall b. may i c. do i d. will i
4. something will have to be done about the air pollution, ______?
a. won’t it b. will it c. has it d. does it
5. they have to study a lot, ______?
a. don’t they b. haven’t they c. did they d. hadn’t they
6. when the car crashed, your brother escaped being hurt, ______ ?
a. didn’t he b. did he c. did it d. didn’t it
7. i’m sure dirty, ______?
a. am i b. isn’t i c. aren’t i d. am not i