Lesson 128 He can’t be...他不可能......He must be...他肯定是......
一.Look,listen and repeat.
看图听录音，然后练习。
1
Is he ill or tired?
He can’t be ill.He must be tired.
2
Is it your new hat or your old one?
It can’t be my new hat.It must be my old one.
3
Is she Danish or Swedish?
She can’t be Danish.She must be Swedish.
4
Is he a dentist or a doctor?
He can’t be a dentist.He must be a doctor.
5
Is she forty or fifty?
She can’t be forty.She must be fifty.
6
Is it the 20th or the 21st today?
It can’t be the 20th.It must be the 21st.
7
Is he the youngest or the oldest of all the children?
He can’t be the youngest.He must be the oldest.
8
Is he reading or sleeping?
He can’t be reading.He must be sleeping.
二.Written exercises书面练习
A Rewrite these sentences，using either has to or I think he is probably...
模仿例句，使用has to或I think he is probably...改写以下句子。
Examples:
He must be home before six o’clock.
He has to be home before six o’clock.
He must be tired.
I think he is probably tired.
1.He must be here at six o’clock.
He has to be here at six o’clock.
2.He must be busy.
I think he is probably busy.
3.He must be at the office early tomorrow.
He has to be at the office early tomorrow.
4.He must be sleeping.
I think he is probably sleeping.
5.He must be French.
I think he is probably French.
6.He must be in France next week.
He has to be in France next week.
7.He must be an engineer.
I think he is probably an engineer.
B Write new sentences.
模仿例句改写以下句子。
Example:
I think she’s Danish.(Swedish)
I don’t think so.She can’t be Danish.
She must be Swedish.
1.I think she’s Italian.(Greek)
I don’t think so.She can’t be Italian.
She must be Greek.
2.I think he’s English.(American)
I don’t think so.He can’t be English.
He must be American.
3.I think they’re Canadian.(Australian)
I don’t think so.They can’t be Canadian.
They must be Australian.
4.I think he’s a mechanic.(engineer)
I don’t think so.He can’t be a mechanic.
He must be an engineer.
5.I think he’s a bus conductor.(bus driver)
I don’t think so.He can’t be a bus conductor.
He must be a bus driver.
6.I think he’s a sales rep.(the boss)
I don’t think so.He can’t be a sales rep.
He must be the boss.
7.I think he’s twenty-four.(thirty)
I don’t think so.He can’t be twenty-four.
He must be thirty.
8.I think they’re five.(seven)
I don’t think so.They can’t be five.
They must be seven.
9.I think he’s seventy-six.(over eighty)
I don’t think so.He can’t be seventy-six.
He must be over eighty.
10.I think she’s fifty-five.(under fifty)
I don’t think so.She can’t be fifty-five.
She must be under fifty.
11.I think it’s the 21st today.(20th)
I don’t think so.It can’t be the 21st today.
It must be the 20th today.
12.I think it’s Tuesday today.(Wednesday)
I don’t think so.It can’t be Tuesday today.
It must be Wednesday today.
13.I think it’s the 2nd today.(3rd)
I don’t think so.It can’t be the 2nd today.
It must be the 3rd today.
14.I think it’s cheap.(expensive)
I don’t think so.It can’t be cheap.
It must be expensive.
15.I think it’s easy.(difficult)
I don’t think so.It can’t be easy.
It must be difficult.
16.I think she’s old.(young)
I don’t think so.She can’t be old.
She must be young.
17.I think they’re early.(late)
I don’t think so.They can’t be early.
They must be late.
18.I think he’s reading.(sleeping)
I don’t think so.He can’t be reading.
He must be sleeping.
19.I think they’re listening to the radio.(watching television)
I don’t think so.They can’t be listening to the radio.
They must be watching television.
20.I think she’s retiring.(looking for a new job)
I don’t think so.She can’t be retiring.
She must be looking for a new job.
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