八下Unit1语法GrammarInfinitives动词不定式:“to+动词原形”(有时可省略to),在句中不能做谓语1
作及物动词的宾语
+todo此类动词有:want,hope,wish,like,begin,start,forget,remember,need,ask,learn,decide,try,offer,plan,refuse,agree,help,remember,forget2
作宾语补足语
+todo;否定结构:v
+not+todo此类动词有:ask,tell,like,love,hat,wouldlike,order,teach,want,wish,advise,注意:(1)不定式符号to在使役动词(let/make/have)和感官动词(see/hear/notice/watch/feel/
如:Isawhimfalloffthetree
Thebossmadetheworkersworkallday
(2)help接动词不定式,不定式符号to可省力,也可不省略
不定式结构可以放在句首,用逗号与句子隔开,也可以句末,不用逗号
如:Togetthereontime,wesetoutearly
Hegoestheretoenjoythefreshair
动词不定式可以和疑问词who(m),which,what,when,how,where(why除外)等连用,构成不定式短语
如:Howtocontrolthepollutionisabigproblem
Idon’tknowwhattodo
语法练习(动词不定式)单项选择
Ourteacheroftenasksus_______questionsingroups
discussB
todiscussC
discuss