初二年级英语动词不定式复习动词不定式构成:肯定式:不定式符号to+动词原形否定式:notto+动词原形一、用作主语1、把不定式置于句首
Togettherebybikewilltakeushalfanhour
2、用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中
①It+be+名词+todoIt'sourdutytotakegoodcareoftheold
②Ittakessb+sometime+todoHowlongdidittakeyoutofinishthework
③It+be+形容词+forsb+todo逻辑主语如:difficult,easy,hard,important,impossible,necessary等;Itisdifficultforustofinishwritingthecompositionaquarterofanhour
④It+be+形容词+ofsb+todo常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid,wise等表示赞扬或批评的词,强调对人的评价
“Itisstupidofyoutowritedowneverything”,theteachersays
⑤Itseems(appears)+形容词+todoItseemedimpossibletosavemoney
3、带疑问词的不定式短语作主语Howtosolvetheproblemishardforhim
二、用作表语动词不定式作表语,通常放在连系动词(主要是be动词)后
ThebestwaytoimproveyourEnglishistojoinanEnglishclub
Thefirstthingistogreettheteacher
注意:不定式作表语表