Unit 4 Growing up Period 3课件(共30张PPT)牛津译林版九年级上册（2024年）.pptxVIP

Grammar;Tolearntousethefollowingconjunctionstointroducetimeclauses:

usingbefore,after,whenandwhile

usingsince,tillanduntil

usingassoonasandwhenever;Lookatthefollowingsentences.;5.Sometimesweforgetwhenweshouldstop.(P37)

6.Itcancheeryouupwhenyouarefeelingsad.(P23)

7.Outside,peoplewererunninginalldirectionswhilepiecesofglassandbrickswerefallingdown.(牛津八年级上U8)

8.Timmywastrappedinadarkplaceaftertheearthquakestopped.(牛津八年级上U8)

9.Hestayedwiththeboyandplayedwithhimfortwohoursbeforetheboy’sparentscame.(牛津七年级下U7);;before的意思是“在……之前”，表示主句动作发生在从句动作之前。如：;when意思是“当……时”，表示主句动作发生的特定时间。如：;while还可以表示“在……期间”，表示主句动作发生在从句动作进行的过程中。如:;注意：在when和while引导的从句中，当主句和从句的主语一致，并且从句中有be动词时，可以省略主语和be动词，构成when/while+-ing结构。如：;1._______thechildrenhavefun,parentscantakedancelessonsonthebeach.

A.WhenB.IfC.WhileD.Once

2._______Igotback,Ifoundmymothercookingforme.

A.When B.Before

C.Since D.Although;Davidiswritinginhisdiaryaboutoneofhisdays.Helphimcombinehissentencesusingbefore,after,whenorwhile.(P54);3.ImetPeter.Iwaswaitingatthebusstop.

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4.IwaswatchingTV.Ireceivedacallfrommyuncle.

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5.Iwasreadytogotobed.Myfathercamebackfromwork.

__________________________________________________;Lookatthefollowingsentences.;since,till和until常用来引导时间状语从句。如：;since意思是“自从……以来”。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。如：;till和until意思是“到……为止”，一般情况下两者可以互换。until可以放在句首或句中，而till不可以用在句首。

注意：如果主句中的谓语动词是瞬时动词时，必须用否定形式，即“not…until”结构，意思是“直到……才（开始）”。如：;1.Tigerswait_______itisdark,thengoouttofindtheirfood.

A.sinceB.untilC.asD.because

2.—YouhavebeeninNanjingverylong?

—Yeah.______myparentscamehere.

A.F