非謂語動詞的用法方法一：較復雜單句的處理方法——找主謂語，

即找主干成分

①However,manyscientistswhospecializeinageingaredoubtfulaboutitandsaythehumanbodyisjustnotdesignedtolastpastabout120years.

二.非謂語動詞todo做狀語和介詞to加謂語的區別。

①

Howhappyweare!Theholidaywehavebeenlookingforward_______atlast.A.tohascome B.tohavecomeC.tohavingcome D.hascome②

Ithinkthisistheveryworkthatwemustfinish____her.A.tohelp B.helpC.helping D.helpedAA分析句子結構，首先判斷空格是做謂語還是非謂語動詞；其次特別注意空格前面的動詞短語的搭配是否還缺少介詞to；最后看介詞to是跟空格前面的動詞短語搭配還是和后面的動詞原形搭配。假如是和前面搭配，空格所選的項就是to加謂語。否則就是todo做目的狀語。

三.非謂語動詞做狀語和特殊句型的區別。

①_______theroadroundtotherightandyou’llfindhishouse.A.Follow B.FollowingC.TofollowD.Followed②

_______theroadroundtotheright,you’llfindhishouse.A.Follow B.FollowingC.TofollowDFollowed

③_______theroadroundtotheright,theblindmanaskedaboytoguidehim.A.Follow B.FollowingC.TofollowD.FollowedAB這里所講的特殊句型是：祈使句，and/or+主語+will+謂語+賓語。假如兩個句子之間有連詞and/or等，就選動詞原形。沒有連詞的話，證明空格是做狀語，根據具體情況選擇非謂語動詞的各種形式。C四、非謂語動詞題目中could的干擾題。①Everyoneinourclasswasworkinghardanddoingwhatwecould_______agoodcollege.A.enterB.toenterC.enteringD.entered②Heranasfastashecould_____tocatchtheearlybus.A.tohopeB.hopeC.hopingD.hoped③

Hespenteveryminutehecould_____spokenEnglish.A.practiceB.topracticeC.practicingD.practisedBc分析句子結構，不要一看到情態動詞就選動詞原形。先判斷could后面是否省略了do,如果是的話一般選todo.如果could前的謂語動詞和答案是固定搭配的話，就根據搭配來選。如果排除以上兩種情況，就要考慮是否是伴隨狀語doing。C五、非謂語動詞中獨立主格結構的用法。

①

Allhertime_______experiments,shehasnotimeforfilms.A.devotedtodo B.devotedtodoingC.devotingtodoing D.isdevotedtodoing②Allthepreparationsfortheproject______,we’rereadytostart.A.completed B.havebeencompletedC.hadbeencompleted D.beencompleted③Allthepreparationsfortheproject______,andwe’rereadytostart.A.completed B.havebeencompletedC.hadbeencompleted D.beencompleted