高一英語Unexplained Mysteries of the Natural World教案
he may have gone back home, because he didn’t say he would take part in her birthday party.
he may not have paid for the bill, because he had lost his job.
(2) 對過去的事情進行猜測，但把握更小時，肯定形式一般用might have done，否定形式用might not have done。如：
they helped send her bat to the hospital; otherwise, she thought, the baby might have died.
she might not have left home when i got to school.
(3) 對過去的事情進行猜測，并且可能性較大時，肯定形式一般用must have done，否定形式一般用can’t have done。如：
your score is the highest; you must have studied very hard.
you can’t have seen her in her office last friday; she’s been out of town for two weeks.
3. practice
ask ss to do activity 2 on page 57. then call back the answers and correct them.
suggested answers:
(1) might have caused
(2) may have cut off
(3) may have survived
(4) might have been killed
4. supplements
explain how to use modal verbs to talk about something which happened at present—perhaps.
用來表猜測的情態(tài)動詞有：must, can, may等，但它們所表示可能性是不同的。
(1) 對現(xiàn)在的事情進行猜測，并且可能性較大時，肯定形式一般用must加動詞原形，此時，must不再表示“必須”，而是表示“肯定”；否定形式一般用can’t加動詞原形，此時，can不再表示“能夠”，而是表示“肯定不……”。如：
i saw him go out just now. he can’t be in his own room.
it must be linda in the classroom, because she is on duty today.
(2) 對現(xiàn)在的事情進行猜測，但把握較小時，肯定形式一般用may加動詞原形，此時，may不再表示“可以”，而是表示“可能”；否定形式一般用may not加動詞原形。如：
he may tell the truth to his father.
she may not angry because she is good-tempered.
(3) 對現(xiàn)在的事情進行猜測，但把握更小時，肯定形式一般用might加動詞原形；否定形式一般用might not加動詞原形。如：
she might not be angry because she usually is very patient.
he might be at home now, but i’m not sure.
(4) 情態(tài)動詞+動詞現(xiàn)在進行時，表示對現(xiàn)在或?qū)碚谶M行的情況進行推測。如：
at this moment, our teacher must be correcting our exam papers.
doctor wang isn’t here. he might be giving a lecture in the hall.
(5) 情態(tài)動詞+動詞的現(xiàn)在完成進行時，表示對過去正在發(fā)生事情的推測。如：
your mother must have been looking for you.
the light was on the whole night. he may have been doing his homework all the time.
5. consolidation
ask ss to translate the following sentences.
(1) 他們也許錯過了那班飛機。
(2) 快點！他們正在機場等我們。
(3) tom是個誠實的孩子。他今晚可能會把真相告訴他父親。
(4) 他五年前來看過我，他也許不費勁就能找到我的住處。
suggested answers:
(1) they may have missed the plane.