2030·HELLOTHERE小清新（匯報：第一PPT）WehavemanyPowerPointtemplatesthathasbeenspecificallydesignedtohelpanyonethatissteppingintotheworldofPowerPointfortheveryfirsttime.UNIT2HEALTHYLIFESTYLEDiscoveringusefulstructures目錄contents1.直接放在句首作主語2.It做形式主語3.和疑問詞構成短語作主語4.只能接不定式口訣1.Toseeisto

believe.2.To

do

this

isto

cut

the

foot

to

fit

the

shoe.3.To

say

isonethingandto

do

isanother.

總結1：

從位置上看，動詞不定式作主語，通常放在句首。當句子主語和表語都是非謂語時，通常要__保持一致_，例如：Toseeistobelieve.=Seeingisbelieving.1.Tobeworkingalldaylongisabore.

2.Tohavemadethesamemistaketwiceisunforgivable.3.Toloveandtobelovedisthegreathappiness.總結2：動詞不定式作主語可以有不同的時態和語態形式。有tobedoing；behavedone;tobedone.主動語態被動語態一般時todotobedone進行時tobedoing完成時tohavedonetohavebeendone語態時態Itisn’trightforustostophalfway.

=Tostophalfwayisnotright.2.It’skindofyoutothinksomuchofus.

=Youarekindtothinksomuchofus.總結3：

動詞不定式的邏輯主語常用_____________來表示，當形容詞修飾動詞不定式時，此時常用介詞_____。當表語形容詞表示不定式的邏輯主語的性質或特征時，則用介詞____。for/of+sbforof1.It’sourduty

todothat.

2.It’samistakenottohelpthem.

3.Itmustbegreatfun

toflytothemooninaspaceship.總結4：以上三個句子的表語都是_______，它們可歸納為:一個共同句式：____________________________名詞it+be+n+todosth1.Ittookmemorethananhourtodomyhomework

yesterdayevening.2.It

will

takeusalongtimetowalkthere.3.Howlongdoesittaketogetthere?

4.Howmuchdiditcostyoutosendthepackage?總結5：

以上四個句子是動詞不定式作真正主語，由

it作形式主語引導的句子，它們的謂語是_____________。它們的共同句式是_________________________________________________，表示某人花多少時間或金錢做某事。

take/costittakes

(costs)sbsometime

/moneyto?do?sthHowtousethecomputerisaquestion.Wheretoputthebikes

isbeingdiscussed.Whenandwheretohavethemeetinghasnotbeendecided.總結6：_____________構成不定式短語作主語。疑問詞包括疑問代詞who、whom、what、which、whose以及疑問副詞when、where和how。此外連接詞whether也適用。此時，疑問詞+todo結構可以轉化為一個__________，例如：Howtousethecomputerisaquestion.

=主語從句Howwecanusethecomputerisaquestion.疑問詞+todoHowlongdoesittakeforyou_______(get)therebybike?Howmuchdiditcostyou_______(send)thepackagetoBeijing?It’simportant_______youtowalkaftersupper.It’sveryrude______youtoturnyourbacktoyourteacherandrefusetoanswer.togettosendforof實戰練習Tomakefriendswiththesenaughtyboys_______(be)nice.When______(hold)

themeetinghasnotbeendiscussedyet.Itseemedapity_____________(waste)somuchtimeonthetaskwithoutachievingourgoal.Tochangeor____________(change)isaquestionwehavetothinkabouteveryday.

is

to

holdtohavewastedtobechanged只能接不定式動詞口訣：決定想做計劃需要同意;能做被用來做的事;迫不及待下決心做過去常常未能做的事;記憶：decidetodosth.want/wouldliketodosth.planto