选择填空。

()1)The sign on the wall means you______stay away from the building.

A.must B.can’t C.shouldn't

()2)How many books______you see on the desk?A.may B.can C.should

()3)It means you______make noise in the library.A.should B..shouldn't C.can

()4)---______you like a glass of milk?---Yes,please.A.May B.Could C.Would

()5)---______you see the sign over there?---Sorry,I can’t.A.Can B.Can’t C.Should

()6)______we go to the park by bus?A.May B.Must C.Shall

4、行为动词

就是我们平时上课时说的动词，表示某一动作或行为。如：sweep、live等。行为动词我们已学过它们的四种形式：原形、第三人称单数+s/es、现在分词（也叫动名词）+ing、过去式+ed。

（1）动词第三人称单数变化规则：

A、一般直接加“s”，如：play–plays,visit–visits,speak–speaks；

B、以“s”，“x”，“sh”，“ch”结尾时，加“es”，如：catch–catches,watch–watches；

C、以“辅音字母+y”结尾时，变“y”为“i”再加“es”，如：carry–carries,study–studies。

（2）现在分词（动名词）构成规则：

A、一般直接加“ing”，如：go–going,do–doing,look–looking；

B、以不发音的“e”结尾的单词，去“e”加“ing”，如：take–taking,make–making,have–having；

C、以重读闭音节结尾的词，如末尾只有一个辅音字母，需要双写这个字母再加“ing”，如：

put–putting,stop–stopping,run–running,get–getting,swim–swimming,sit–sitting,begin–beginning,

jog–jogging,forget–forgetting。

（3）过去式构成规则：

A、一般直接加“ed”，如：plant–planted,visit–visited,pick–picked；

B、以不发音字母“e”结尾，直接加“ed”，如：like–liked,hope–hoped,taste–tasted；

C、以“辅音字母+y”结尾时，变“y”为“i”再加“ed”，如：try–tried,carry–carried,study–studied；

D、有些动词要双写最后一个字母，再加“ed”，如：stop–stopped；

E、还有很多动词的过去式是不规则的，请记忆：

是-am(be)-was-being；是-are(be)-were-being；是-be-was,were-being；

成为-become-became-becoming；开始-begin-began-beginning；弯曲-bend-bent-bending；

吹-blow-blew-blowing；买-buy-bought-buying；能-can-could-----；

捕捉-catch-caught-catching；选择-choose-chose-choosing；来-come-came-coming；

切-cut-cut-cutting；做-do,does-did-doing；画-draw-drew-drawing；饮-drink-drank-drinking；吃-eat-ate-eating；感觉-feel-felt-feeling；发现-find-found-finding；飞-fly-flew-flying；忘记-forget-forgot-forgetting；

得到-get-got-getting；给-give-gave-giving；走-go-went-going；成长-grow-grew-growing；

有-have,has-had-having；听-hear-heard-hearing；受伤-hurt-hurt-hurting；保持-keep-kept-keeping；

知道-know-knew-knowing；学习-learn-learned,learnt-learning；允许，让-let-let-letting；躺-lie-lay-lying；

制造-make-made-making；可以-may-might----；意味-mean-meant-meaning；会见-meet-met-meeting；

必须-must-must----；放置-put-put-putting；读-read-read-reading；骑、乘-ride-rode-riding；

响、鸣-ring-rang-ringing；跑-run-ran-running；说-say-said-saying；看见-see-saw-seeing；将-shall-should----；唱歌-sing-sang-singing；坐下-sit-sat-sitting；睡觉-sleep-slept-sleeping；说-speak-spoke-speaking；

度过-spend-spent-spending。

练一练：

1、写出下列动词的第三人称单数。