1) 情态动词 ( 除ought 外,ought to): 2) 使役动词 let, have, make 3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find I saw him dance. =He was seen to dance. The boss made them work the whole night.=They were made to work the whole night. 4) would rather,had better: 5) Why… / why not…: 6) help 可带to,也可不带to, help sb. (to) do sth.: 7) but和except:but前是动词do时,后面出现的动词用不带to的动词不定式。 8) 由and, or和than连接的两个不定式,第二个to 可以省去: (二)、基础过关练习 1、---- I usually go there by train. ---- Why not ___ by boat for a change? A. to try going B. trying to go C. to try and go D. try going 解析:why not 后面接不带to 的不定式,因此选D。 答案:D 2、A watch is made___ time. A. tell B. to tell C. telling D. told 解析:make后接不带to 的动词不定式,当其用于被动时,to 不可省略。 答案:B (三)、能力提高练习 1、Paul doesn't have to be made ___. He always works hard. A. learn B. to learn C. learned D. learning 解析:make后接不带to 的动词不定式,当其用于被动时,to 不可省略。 答案:B 2、I have no one ______ me, for I am a new comer here. A. help B. helping C. to help D. to have helped 解析:本题易误选A。根据句意可知空白处的非谓语是作定语,是have sb./ sth. to do结构,要区别开have(使…) sb. do sth.结构。 答案:C 3、I’m going to Xi’an. Do you have anything______ to your parents? A. to be taken B. to take C. take D. to buy 解析:句意:你有什么需要带给你父母的吗?是被带给父母,选A。 答案:A