英文課堂筆記-Mon,May21,2012
The Notes of English Course
Mon, May 21- 2012
第一部分:每人提问,这个周末,你都做了些什么?
第二部分:语法,Unit 27 Must (have) and can’t (have)
A, Study this example situation:
Liz ia a very good tennis player, and not many players beat her. But yesterday she played against Bill and Bill won. So:
Bill must be a very good player (otherwise he wouldn’t have won).
We use must to say we are sure that something is true:
1,You’ve been traveling all day. You must be tired. (= I an sure that you are tired.)
2,I hear that your exams are next week. You must be studying very hard right now. (= I am sure that your are studying.)
3,Carol knows a lot about films. She must like to go to the movies. (= I am sure she likes to go to the movies.)
We use can’t to say that we think something is impossible:
1,You’ve just had dinner. You can’t be hungry already. (= It is impossible that you are hungry.)
2,Tom said that he would be here ten minutes ago, and he is never late. He can’t be coming.
Study the structure:
be tired/hungry, etc.
I/you/he (etc.) must be studying/waiting/coming, etc.
can’t know/like, etc.
B, For the past we use must have (done) and can’t have (done). Study this example:
We went to Roy’s house last night and rang the doorbell. There was no answer.
He must have gone out (otherwise he would have answered).
The phone rang, but I didn’t hear it. I must have been asleep.
I made a lot of noise when I came home. You must have heard me.
She passed me on the street without speaking. She can’t have seen me.
Tom wolked into the wall. He can’t have been looking where he was going.
Study the structure:
hve been asleep/tired, etc.
I/you/he (etc.) must have been looking/waiting, etc.
can’t have gone/done/seen/heard, etc.
“Couldn’t have (done)” is possible instead of “can’t have (dong)”