1．Where do you think you are?你認為你現在是在哪兒？
do you think 是用在特殊疑問句中的插入語，用來征詢見解或表達看法。因為句中插入語已經是疑問式，主謂倒裝了，所以you are的位置不能再對調了。插入語一般是對句子加一些附加的解釋，在句子中作獨立成分。常用來作插入語的結構有I hope, I think, I'm afraid, you know等。插入語可以位于句尾或句中，有時也可出現在疑問句中。
2．must have been doing sth.,一定/準是在做某事。
這種結構用來表示對過去正進行的事情的推測。下文中的can't have been是 can't have been driving的省略式，在意思上與must have been driving正相反。
3．That's why I didn't see the sign.所以我才沒看見那牌子。
why I didn't see the sign作is的表語從句，以why引導的從句用來解釋事情的原因。
4．…you'd better take my advice!……你還是聽從我的勸告吧！
take one's advice是“聽從勸告”的意思。
語法 Grammar in use
表示猜測和推斷的情態(tài)助動詞must和can't（2）
must與can't不僅能表達對現在和將來的猜測和推斷，而且能表達對過去的猜測和推斷——這時可用 must have been表示肯定的推斷，用can't have been（而不是mustn't have been）來表示否定的推斷，如后面跟進行時則表示對過去正在進行的動作的猜測。請看例句：
You must have been driving at seventy miles an hour.
你當時肯定正以每小時70英里的速度行駛。
I didn't see it. I must have been dreaming.
我沒看見。我當時一定是在胡思亂想吧。
She can't have been 29.She must have been 36.
她那時肯定不會是29歲，她一定36歲了。
He can't have been reading. He must have been sleeping.
他那時肯定不是在看書，他準是在睡覺。
詞匯學習 Word study
1．charge v.
（1）罰款；使承受經濟負擔：
He was charged by the policeman for speeding.
他因開車超速而被警察罰款。
（2）要（價）；收（費）：
The hotel charged them ￡ 900 for one night.
飯店向他們索要900英鎊作為住一晚的費用。
（3）指控；指責：
They charged him with murder.
他們指控他犯了謀殺罪。
2．dream v.
（1）做夢；夢見：
He dreamt about his grandmother last night.
他昨天夜里夢見他的祖母了。
Do you often dream at night?
你晚上經常做夢嗎？
（2）夢想；幻想：
She dreamed that one day she would be as free as a bird
她幻想著有一天自己能像鳥兒那般自由。
I once dreamed of becoming a famous doctor.
我曾一度夢想著成為一位的醫(yī)生。
（3）出神；心不在焉；空想：
Don't dream away your life!
不要在想入非非中虛度你的人生。
Sorry, I didn't see the sign. I must have been dream ing.
對不起，我沒看見那牌子。我一定是思想開小差了。
3．wave v.
（1）招手；揮手示意：
He waved us quiet.
他揮手要我們別出聲。
She waved me goodbye.
她向我揮手告別。
（2）起伏；飄動：
The flag is waving in the wind.
旗幟正在風中飄揚。
She was attracted by the waving sea.
她被那洶涌起伏的大海吸引。
練習答案 Key to written exercises
Lesson 130
A
1 He didn't come to work yesterday. He must have been ill.
2 He didn't come to the office this morning. He had to stay a home.
3 I don't think she was Austrian. She must have been German.
4 I lost my pen so I had to buy a new one.
5 He forgot his case so he had to return home.
6 She didn't hear the phone. She must have been sleeping.
B
1 I don't think they were. They can't have been Canadian.
They must have been Australian.
2 I don't think she was. She can't have been Finnish.
She must have been Russian.
3 I don't think they were. They can't have been Japanese.
They must have been Chinese.
4 I don't think they were. They can't have been butchers.
They must have been bakers.
5 I don't think she was. She can't have been a dentist.
She must have been a doctor.
6 I don't think he was. He can't have been a sales rep.
He must have been the boss.
7 I don't think she was. She can't have been seventeen.
She must have been twenty-one.
8 I don't think they were. They can't have been five.
They must have been seven.
9 I don't think he was. He can't have been seventy-six.
He must have been over eighty.
10 I don't think she was. She can't have been fifty-five.
She must have been under fifty.
11 I don't think it was. It can't have been the 17th yesterday.
It must have been the 16th yesterday.
12 I don't think it was. It can't have been Tuesday yesterday.
It must have been Wednesday yesterday.
13 I don't think it was. It can't have been the 19th yesterday.
It must have been the 20th yesterday.
14 I don't think it was. It can't have been cheap.
It must have been expensive.
15 I don't think it was. It can't have been easy.
It must have been difficult.
16 I don't think she was. She can't have been old.
She must have been young.
17 I don't think he was. He can't have been ill.
He must have been tired.
18 I don't think they were. They can't have been listening to the radio.
They must have been watching television.
19 I don't think she was. She can't have been retiring.
She must have been looking for a new job.
20 I don't think they were. They can't have been sitting.
They must have been standing.
do you think 是用在特殊疑問句中的插入語，用來征詢見解或表達看法。因為句中插入語已經是疑問式，主謂倒裝了，所以you are的位置不能再對調了。插入語一般是對句子加一些附加的解釋，在句子中作獨立成分。常用來作插入語的結構有I hope, I think, I'm afraid, you know等。插入語可以位于句尾或句中，有時也可出現在疑問句中。
2．must have been doing sth.,一定/準是在做某事。
這種結構用來表示對過去正進行的事情的推測。下文中的can't have been是 can't have been driving的省略式，在意思上與must have been driving正相反。
3．That's why I didn't see the sign.所以我才沒看見那牌子。
why I didn't see the sign作is的表語從句，以why引導的從句用來解釋事情的原因。
4．…you'd better take my advice!……你還是聽從我的勸告吧！
take one's advice是“聽從勸告”的意思。
語法 Grammar in use
表示猜測和推斷的情態(tài)助動詞must和can't（2）
must與can't不僅能表達對現在和將來的猜測和推斷，而且能表達對過去的猜測和推斷——這時可用 must have been表示肯定的推斷，用can't have been（而不是mustn't have been）來表示否定的推斷，如后面跟進行時則表示對過去正在進行的動作的猜測。請看例句：
You must have been driving at seventy miles an hour.
你當時肯定正以每小時70英里的速度行駛。
I didn't see it. I must have been dreaming.
我沒看見。我當時一定是在胡思亂想吧。
She can't have been 29.She must have been 36.
她那時肯定不會是29歲，她一定36歲了。
He can't have been reading. He must have been sleeping.
他那時肯定不是在看書，他準是在睡覺。
詞匯學習 Word study
1．charge v.
（1）罰款；使承受經濟負擔：
He was charged by the policeman for speeding.
他因開車超速而被警察罰款。
（2）要（價）；收（費）：
The hotel charged them ￡ 900 for one night.
飯店向他們索要900英鎊作為住一晚的費用。
（3）指控；指責：
They charged him with murder.
他們指控他犯了謀殺罪。
2．dream v.
（1）做夢；夢見：
He dreamt about his grandmother last night.
他昨天夜里夢見他的祖母了。
Do you often dream at night?
你晚上經常做夢嗎？
（2）夢想；幻想：
She dreamed that one day she would be as free as a bird
她幻想著有一天自己能像鳥兒那般自由。
I once dreamed of becoming a famous doctor.
我曾一度夢想著成為一位的醫(yī)生。
（3）出神；心不在焉；空想：
Don't dream away your life!
不要在想入非非中虛度你的人生。
Sorry, I didn't see the sign. I must have been dream ing.
對不起，我沒看見那牌子。我一定是思想開小差了。
3．wave v.
（1）招手；揮手示意：
He waved us quiet.
他揮手要我們別出聲。
She waved me goodbye.
她向我揮手告別。
（2）起伏；飄動：
The flag is waving in the wind.
旗幟正在風中飄揚。
She was attracted by the waving sea.
她被那洶涌起伏的大海吸引。
練習答案 Key to written exercises
Lesson 130
A
1 He didn't come to work yesterday. He must have been ill.
2 He didn't come to the office this morning. He had to stay a home.
3 I don't think she was Austrian. She must have been German.
4 I lost my pen so I had to buy a new one.
5 He forgot his case so he had to return home.
6 She didn't hear the phone. She must have been sleeping.
B
1 I don't think they were. They can't have been Canadian.
They must have been Australian.
2 I don't think she was. She can't have been Finnish.
She must have been Russian.
3 I don't think they were. They can't have been Japanese.
They must have been Chinese.
4 I don't think they were. They can't have been butchers.
They must have been bakers.
5 I don't think she was. She can't have been a dentist.
She must have been a doctor.
6 I don't think he was. He can't have been a sales rep.
He must have been the boss.
7 I don't think she was. She can't have been seventeen.
She must have been twenty-one.
8 I don't think they were. They can't have been five.
They must have been seven.
9 I don't think he was. He can't have been seventy-six.
He must have been over eighty.
10 I don't think she was. She can't have been fifty-five.
She must have been under fifty.
11 I don't think it was. It can't have been the 17th yesterday.
It must have been the 16th yesterday.
12 I don't think it was. It can't have been Tuesday yesterday.
It must have been Wednesday yesterday.
13 I don't think it was. It can't have been the 19th yesterday.
It must have been the 20th yesterday.
14 I don't think it was. It can't have been cheap.
It must have been expensive.
15 I don't think it was. It can't have been easy.
It must have been difficult.
16 I don't think she was. She can't have been old.
She must have been young.
17 I don't think he was. He can't have been ill.
He must have been tired.
18 I don't think they were. They can't have been listening to the radio.
They must have been watching television.
19 I don't think she was. She can't have been retiring.
She must have been looking for a new job.
20 I don't think they were. They can't have been sitting.
They must have been standing.