不定式是动词的一种非限定形式,由“to+动词原形”构成,没有人称和数的变化,在句中不能独立作谓语
但不定式具有名词、形容词和副词的特征,在句中可以作主语、宾语、宾语补足语、表语、定语、状语等
Grammar:theInfinitiveTodothatsortofthingisfoolish
Iwanttoseeyouthisevening
Allyouhavetodoistofinishitquickly
Wefoundahousetolivein
ShecameheretostudyEnglish
Iwarnedthepatientnottoeatcoldwateraftertheoperation
主语宾语表语定语状语宾补一、用法1
作主语2)用it作形式主语用不定式(It+be+adj
+todosth)3)例外:Itisnogood/nouse/nohelp+doingsth
Itisnousearguingaboutit
1)常用动名词LearningEnglishisveryimportant
ItisimportanttolearnEnglish
作宾语1)v+只跟todolearn/agree/ask/offer/happen/pretend/promise/plan/intend/hope/wish/decide/refuse/fail/manage…Shehopestofindabetterjob
Iwishtogowithyou
2)v+只跟doingfinish/complete/enjoy/mind/practise/consider/suggest/advise/miss/avoid/admit/deny/permit/allow/forbid/imagine/understand/include/risk/delay…Keep(on)