modal verb[下学期]
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课件17张PPT。情态动词1)must 肯定句 “一定”、 “准是”
2)can /could 否定句、疑问句 ；could也可用于肯定句。
3)may/ might 肯定句 、否定句 “或许”、“大概”、“可能”must > can/may > could/ might1、对现在状态推测 ：must/can/could/may/ might + do
2、对现在正在进行的动作的推测：must/can/could/may/ might + be doing
eg:---Can he be watching TV now?
---Yes, he must be watching TV now .---No, he can’t/ couldn’t be watching TV now .
3、对过去事实的推测： must/can/could/may/ might +
have done
eg: I didn’t hear the telephone just now. I must have been
asleep.
1、我经常在这儿看见他，他一定住在附近。
2、昨晚一定下雨了，因为地上是湿的。
I often see him here, so he must live nearby.It must have rained last night, for the ground is wet.3、她昨天可能没回家。
4、妈妈这会儿可能在做午饭。She may/ might not have gone home yesterday.Mother may be cooking lunch now.情态动词+ have done 表虚拟
1、might/ could + have done:表过去本可以做而实际未做的事.“本来可以…” (may/can have done没这意思)
eg: He might / could have given you more help, even if he was very busy.
2、should/ought to + have done, 肯定句中，表过去应该做而实际未做；否定句中，表过去不该做的事 却做了。
eg: 1) I should/ought to have had a talk with her , but I was too busy.３、needn’t have done表过去做了不必做的事。
“本来不必……”
You needn’t have hurried. There was plenty of time.4、would rather (not) + have done 表“当时宁愿做了某事”。我宁愿当时把这件事告诉了他。I would rather have told him about it.５、would like/ love to + have done表过去本来愿意或打算做某事而实际未做。eg:1)I would love to have gone to the party last night, but I had to study.2) 我本来想给你买一份生日礼物的，但我没钱。I would like to have bought you a present for
your birthday, but I was short of money.几个值得注意的情态动词１、must表与说话人的愿望相反或不耐烦，“偏偏”1)Why must you be so lazy?
你为什么偏偏这么懒呢？２)正当我坐下来吃饭时，电话偏偏响了。Just as I was sitting down to supper, the telephone must ring.2、should ①表说话人惊讶或难以置信，“竟然”。eg:1)It’s strange that you should mention it.
你竟然提起这件事真是太奇怪了。2)Why should you think that?
你为什么那么想？3)我没想到你竟然这么快就完成了工作。I didn’t expect that you should have finished the work so soon. ②用于if条件句中，加强语气，“万一”eg:1) If he should come here, please let me know.
如果他万一来这儿，请让我知道。2) If anyone should call, tell him I’m busy.
如果万一有人打电话，告诉他我很忙。
2)can /could 否定句、疑问句 ；could也可用于肯定句。
3)may/ might 肯定句 、否定句 “或许”、“大概”、“可能”must > can/may > could/ might1、对现在状态推测 ：must/can/could/may/ might + do
2、对现在正在进行的动作的推测：must/can/could/may/ might + be doing
eg:---Can he be watching TV now?
---Yes, he must be watching TV now .---No, he can’t/ couldn’t be watching TV now .
3、对过去事实的推测： must/can/could/may/ might +
have done
eg: I didn’t hear the telephone just now. I must have been
asleep.
1、我经常在这儿看见他，他一定住在附近。
2、昨晚一定下雨了，因为地上是湿的。
I often see him here, so he must live nearby.It must have rained last night, for the ground is wet.3、她昨天可能没回家。
4、妈妈这会儿可能在做午饭。She may/ might not have gone home yesterday.Mother may be cooking lunch now.情态动词+ have done 表虚拟
1、might/ could + have done:表过去本可以做而实际未做的事.“本来可以…” (may/can have done没这意思)
eg: He might / could have given you more help, even if he was very busy.
2、should/ought to + have done, 肯定句中，表过去应该做而实际未做；否定句中，表过去不该做的事 却做了。
eg: 1) I should/ought to have had a talk with her , but I was too busy.３、needn’t have done表过去做了不必做的事。
“本来不必……”
You needn’t have hurried. There was plenty of time.4、would rather (not) + have done 表“当时宁愿做了某事”。我宁愿当时把这件事告诉了他。I would rather have told him about it.５、would like/ love to + have done表过去本来愿意或打算做某事而实际未做。eg:1)I would love to have gone to the party last night, but I had to study.2) 我本来想给你买一份生日礼物的，但我没钱。I would like to have bought you a present for
your birthday, but I was short of money.几个值得注意的情态动词１、must表与说话人的愿望相反或不耐烦，“偏偏”1)Why must you be so lazy?
你为什么偏偏这么懒呢？２)正当我坐下来吃饭时，电话偏偏响了。Just as I was sitting down to supper, the telephone must ring.2、should ①表说话人惊讶或难以置信，“竟然”。eg:1)It’s strange that you should mention it.
你竟然提起这件事真是太奇怪了。2)Why should you think that?
你为什么那么想？3)我没想到你竟然这么快就完成了工作。I didn’t expect that you should have finished the work so soon. ②用于if条件句中，加强语气，“万一”eg:1) If he should come here, please let me know.
如果他万一来这儿，请让我知道。2) If anyone should call, tell him I’m busy.
如果万一有人打电话，告诉他我很忙。