warm up :根据实际情况回答下列问题：Oral English
1.定义：现在完成时表示到目前为止已经完成，并对现在留下某种后果和影响的动作。
1.表示过去发生的某一动作对现在造成的影响或结果,常与一些时间状语
•如:already, yet, ever, never, just, before, once,twice等连用,也可以和包括现在在内的时间状语,如these days,today,this year,so far等连用.
•2.表示过去发生的动作或存在的状态,一直持续到现在,也许还将继续下去,可以和表示从过去某一时刻延续到现在的一段时间的状语连用
即for +时间段,since+时间点/从句, in the last ten years等,谓语只可用延续性动词.
has/have been to
have/has gone to
have/has been in
英语动词根据词义可分为两种,一种是延续性的,一种是终止性的,终止性动词(也可称为非延续性动词,瞬间动词,或点动词),如begin,start,die,buy,leave, come等,表示动作的发生与结束于一瞬间完成,不能再延续,所以它的现在完成时不能和表示延续的时间状语连用,即不能与表示一段时间的状语,for+时间段, since+时间点/从句连用,也不能用在how long引导的特殊疑问句
动词
下面呢，我们就各个击破。先讲系动词。
一 系动词：
系动词除了be的形式之外，还有become，get，grow，turn，sound，look，smell，taste等，它们不能单
独作谓语,必须和作表语的词语(如形容词, 名词等) 连用, 如：It smells delicious.(它闻起来味道很美)。
delicious 是形容词，不是副词。
二 情态动词：
首先要记住情态动词后必跟动词原形。must和need几乎是每年的必考题，这里我们重点讲一下。
must的意思是"应当，必须"，侧重于说话者的主观看法，没有时态变化，其否定式是mustn't，在"Must I(we) ...."的疑问句中，须注意的是其否定回答常用needn't。如：Must I go?(我一定要走吗?) No,you needn't.(不，不必。)
need意为"需要"。既可作实义动词，又可作情态动词，因此在用法上需要注意。作实义动词时，need后跟名词，动名词，或不定式。如：I need to go. (我得走了。) 作情态动词时，后跟动词原形。如：You needn't come tomorrow if you are busy. (如果你忙，明天就不必来了。)
三 实意动词：
我们跑(run)，我们跳(jump)，我们笑(laugh)，这些都得用实意动词来表达。我们一起来看一看一些特殊的词吧。它们在接动名词和不定式时意义有所不同。
stop：
When the teacher came in, they stopped to read.
When the teacher came in, they stopped talking.
forget，remember，regret 这三个词用法基本相同，
如：The light is still on. He forgot to turn it off. 灯还在亮着，他忘记关了。 ( 没有做关灯的动作) He forgot turning the light off. 他忘记他已经关了灯了。( 已做过关灯的动作)
感官动词：see,watch, notice,look at,hear,listen to,smell,taste,feel 等 +do 表示动作的完整性，真实性 +doing 表示动作的连续性，进行性。如：I saw him work in the garden yesterday. 昨天我看见他在花园里干活了。(强调"我看见了"这个事实) I saw him working in the garden yesterday.（强调"我见他正干活"这个动作）昨天我见他正在花园里干活。
练习：
1. Wang Lin _______some help. Can you help him?
A. needs
B. want
C. need to
D. ask
2. All of us enjoy _______football very much.
A. play
B. playing
C. played
D. to play
3. ---- The light in the classroom is still on.
---- Oh，I forgot___.
A. turning it off
B. turn it off
C. to turn it off
D. having turned it off
4. I regret ___ the window.
A. to do
B. to be doing
C. to have done
D. having broken
5. His grandparents saw her ___ up from childhood.
A. grow
B. grew
C. was growing
D. to grow
6. ---What's this in English?
---Sorry, I can't _____it in English.
A. tell
B. say
C. speak
D. talk
7. --- _____I finish my homwork today?
---No, you needn't.
A. Can
B. May
C. Must
D. Need
8. In Spring , the days ______longer and longer, the trees _______green.
A. get, turn
B. gets, turns
C. got, turned
D. have got, have turned
9. When the traffic lights are red, you ________stop.
A. can
B. must
C. won't
D. needn't
10. When the teacher came into the classroom, I ________to my deskmate.
A. stopped to talk
B. stopped talking
C. stop to talk
D. stop talking
现在完成时
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