TheartofhavingfunUnit4Understandingideas—GrammarLearningObjectives1.learnimperativesandfindouttherules.2.dosomeexercisestouseimperativesflexibly.3.useimperativesinrealcontexts.Inthislesson,wewill:什么是祈使句？祈:祈求使:使得祈求一個(gè)人使得他去做一件事，或者不做一件事的句子就是祈使句。祈使句用來表達(dá)叮囑、希望、命令、請求、勸告、警告、禁止等。祈使句一般沒有主語，說話的對象都是第二人稱“你”或“你們”，所以也可以理解為省略了主語you。祈使句以動詞原形開頭、無時(shí)態(tài)和數(shù)的變化。句末可以用感嘆號來表達(dá)比較強(qiáng)烈的語氣，也可以用句點(diǎn)結(jié)尾。祈使句的肯定形式：祈使句的句型結(jié)構(gòu)1.Do型：（動詞原形+其他成分）e.g.Listentome!2.Be型：（Be+形容詞/名詞+其他成分）e.g.Beapolitestudent!3.Let型：（Let+賓語+動詞原形+其他）e.g.Letmehelphim!祈使句的否定形式：祈使句的句型結(jié)構(gòu)1.Do型：（Don’t+動詞原形+其他成分）e.g.Don’truninthelibrary!2.Be型：（Don’t+be+形容詞/名詞+其他成分）e.g.Don’tbelateforclass!祈使句的否定形式：祈使句的句型結(jié)構(gòu)3.Let型兩種：（Don’tlet+賓語+動詞原形+其他/Let+賓語+not+動詞原形+其他）e.g.Don’tlethimrun.=Lethimnotrun.4.No型：表示禁止（No+動名詞/名詞）e.g.Nosmoking.5Readthesentencesfromthereadingpassageandsummarise

the

grammarrules.(a)Imaginestayingonanislandalone.(b)Don'tforgettotakesometimeouttohavefunandenjoylife!Nowfindmoresentenceswiththesestructuresinthereadingpassage.6Completetheinstructionswiththeverbsinbrackets.Usedon't

appropriately.1.___________(worry)aboutwinning—justenjoyyourselfinsports.2.______(try)toputfunintoyourdailylife,likelisteningtomusic

whiledoinghousework.3.________(read)thispassagetofindwhyweshouldhavefun.Don’tworryTryReadShareExploreMakeDon’tmissoutcallJoinEnjoydoingawaywithbadfeelings

keepingusfeelingyouthful

liftingourspiritsUsefulexpressions.Funcan...

.Havingfunisagoodwayto....Funalso...

.Rememberthat....Researchshowsthatfun...

.Don'tforget...Teamwork,communication,andpersonalgrowth.一、單項(xiàng)選擇1.“Bequiet!”屬于祈使句的哪種類型？（

）

A.Do型

B.Be型

C.Let型

D.No型2.“Don'ttalkinclass.”屬于祈使句的哪種否定形式？（

）

A.Do型

B.Be型

C.Let型

D.No型3.“Let'sgotothepark.”的否定形式是（

）。

A.Let'snotgotothepark.

B.Notlet'sgotothepark.

C.Don'tletusgotothepark.

D.Notgoingtothepark.BAA二、句型轉(zhuǎn)換1.Lethimplaybasketball.[改為否定句(兩種形式）]2.Beagoodboy.（改為否定句）3.Doyourhomework.（改為否定句）Don'tlethimplaybasketball./Lethimnotp