動詞不定式講解

1、一動詞不定式：to動詞原形動詞原形1.基本用法：可在句中作主、賓、表、定、狀、補。1）作主語Togetupearlyisagoodhabit.Itssonicetohearyourvoice.(it為形式主語)ItisimptantfustolearnEnglishwell.It’ssillyofyoutodosuchathing.HowtoimproveourEnglishisstillaproblem.2)作賓語Weallhopet

2、oseeyou.TheyfoundithardtolearnChinese.（it為形式賓語）Idonotknowwhattodonext.（疑問詞不定式）HeaskedmehowtoimproveEnglish.（疑問詞不定式）3）作表語①一般情況Mywkistocleantheroomeveryday.Hisdreamistobeadoct.Thequestionishowtoputitintopractice.問題是怎樣把它付諸實

3、施。Heseemedtohaveknownthenews.②如果主語是不定式，則表語也用不定式。例如：Toseeistobelieve.Seeingisbelieving.③作表語的不定式有時可省略符號to：這時主語部分必須含有動詞do而作表語的不定式則解釋do的精確意思。AllIdidwas(to)givehimalittlehelp.Whatwewanttodonowis(to)havearest.4)作定語①不定式作定語時，被修飾

4、的名詞常為它的邏輯賓語。不定式與該名詞存在邏輯上的動賓關(guān)系。Ihavesomeclothestowash.（后置定語）Thisquestioniseasytoanswer.6）作補語Hewantshissontobecomealawyer.Sheencouragedmetotryagain.Theypersuadedhimtogiveupsmoking.Theybelievehimtobewritinganewbook.他們認為他正在寫

5、一本新書。Hewantedthelettertobetypedatonce.Theletterwaswantedtobetypedatonce.(主補)注：有些動詞后跟不帶to的不定式作賓語補足語。常見的有：①感官動詞feelhearseewatchnoticeobserve②使役動詞letmakehave③help：helpsb.do……或helpsb.todo……兩種說法均可。Ioftenhearhimsingthissong.Th

6、ebossmadethewkerswk12hoursaday.當(dāng)此類句子改為被動語態(tài)時，要補上to.Heisoftenheardtosingthissong.Thewkersweremadetowk12hoursaday.☆在thinkfindconsiderdiscover等動詞后常用tobeadj.結(jié)構(gòu)作賓補，有時tobe可省略。Weallthinkconsiderfinddiscoverhim(tobe)kindhonest.我們