高二英語Astronomy教案
t:well done!look at the underlined parts.what can you find?
ss:they’re all in different forms.
t:you’re quite careful.they’re in different forms.in the first sentence we use the passive voice in the present indefinite.in the second sentence we use the passive voice in the past indefinite.the third,the passive voice in the future indefinite.the fourth is the passive voice in the present perfect.the fifth is the passive voice in the present continuous.the last one is the passive voice with a modal verb.are you clear?
ss:yes.
t:good.you must pay more attention to the predicate forms in passive voice in different tenses.you must be careful.
step ⅲ practice
t:now,let’s do some more exercises.look at the screen,please.
(show the following on the screen.)
turn the following sentences into the passive voice:
1.we speak chinese here.
2.i finished my homework in two hours.
3.they were making a model plane.
4.they have finished the work.
5.we can change water into ice.
6.you ought to ask for his advice.
7.when will you paint the wall?
8.have you found your book?
t:finish the exercise quickly by yourself and then check your answers in pairs.a moment later,i’ll ask some of you to read out your answers one by one.
suggested answers:
1.chinese is spoken here.
2.my homework was finished in two hours.
3.a model plane was being made.
4.the work has been finished.
5.water can be changed into ice.
6.his advice ought to be asked for.
7.when will the wall be painted?
8.has your book been found?
step ⅳ explanation and practice
t:(bb:we must take good care of the children.)please look at the blackboard.change the sentence into the passive voice.who’d like to have a try?
s1:i’d like to.the children must be taken good care.
t:do you agree with her/him?
s2:i think the sentence should be “the children must be taken good care of”.(teacher writes it on the blackboard.)
t:very good.in this sentence the predicate is a phrase,when we change it into the passive voice,we must look on the phrase as a whole.we shouldn’t miss the adverb or preposition in the phrase.do you understand?
ss:yes.
t:ok.now,let’s do some exercises.look at the screen,please.
(show the following on the multimedia.)
turn the following into the passive voice:
1.we have never heard of such things before.
2.they listened to her with great interest.
3.a peasant woman brought the child up.
4.they often made fun of him in school.
5.i’ll look after your baby well.
6.we must take down the notice quickly.
(give the students enough time to do these exercises,and then check the answers with the whole class.)