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1、动词不定式通常带有符号to，叫做带to的动词不定式(infinitivewith"to")，动词不定式有时不带符号to，叫做不带to的动词不定式(infinitivewithout"to")不带to的动词不定式通常有下面十八种情况一、与助动词do连用构成谓语动词的否定、疑问和强调形式。(1)hedoesnotworkinthefactory.(2)Doessheworkhere？(3)Ididnotseeheryesterday.(4)Didtheytakeyouhome?(5)Hedoeslooktired.(6)
2、Theydidcomeyesterday.二、与情态动词连用构成复合谓语(1)IcanspeakEnglish.(2)MayIcomein?(3)Dareheswimacrosstheriver?(4)Wemustwork,andaboveallwemustbelieveinourselves.(5)Couldyoudosomethingforme?(6)Youshallgoatonce.(7)Hemightbeworkingintheofficenow.(8)Idon'tthinkyouneedhavecomeyest
3、erday.(9)Theyshouldbeherebynow.(10)Ifyouwillgointothefieldsandturnoverafewbigstones,youaresuretouncoveracityofant"people".但与情态动词ought(to)连用时通常带to，和used(to)连用时必须带to三、在表示感觉的动词如：see,look.at,watch,hear,listento,feel,notice,observe,perceive(觉察，看见),behold（书面用语“见到”）等后用作宾语补足
4、语的动词不定。(1)Isawhercrossthestreet.(2)Helookedatthechildrenwalkupthehill.(3)Iwatchedtheboycrosstheroad.(4)Iheardherplaythepiano.(5)Helistendtoustalk.(6)Ifeltthefloormove.(7)Ididn’tnoticeyouenter.(8)Heobservedsomeoneopenthedoor.(9)Ididnotperceiveanyonecomein.(10)H
5、ebeheldhergoout.但除notice,watch不用被动语态外，上述动词变成被动语态时，其后的动词不定式就不省to(1)Shewasseentocrossstreet.(2)Shewasheardtoplaythepiano.四、使役动词make,let,have,bid,leave(=let)后作宾语补足语的动词不定式不带to(1)Youmaytakeahorsetothewater,butyoucan'tmakehimdrink.(2)I'lllethimdoit.(3)Don'tforgettohave
6、themcome.(4)Bidhimgohome.(5)Leavehimgo.动词have通常不用于被动语态，make和bid可用于被动语态，let偶尔也可用于被动态，用作主语补足语的动词不定式通常带to，但在make和let后有时可以不带to(1)Johnwasmadetowashthetruckforaweekasapunishment.(2)Hewasmade(to)laugh.(3)Thechildwaslet(to)doit.五、never与know连用其后作宾语补足语的动词不定式可省to，其时态多为完成时态。
7、(1)Ineverknewhimactwithoutthinking.(2)I'veneverknownitsnowinJulybefore.(3)Ihadneverknownheraskforpitybefore.有时ever与known连用也有上述用法。(1)Haveyoueverknownmetellalie?六、在find后作宾语补定语的动词不定式有时可以省to，但如动词为be，那么一般不省to，要省一起省略"tobe"(1)Wefoundthefarmcrops(to)dowell.(2)IfindtheChine
8、sepeopletobehappyandcheerful.(3)Ifoundthistobetrueinallthecities.(4)Wefoundhim(tobe)honest/dishonest.七、在cannotbut,ca
