3、kafterhersister.她不得不帮着她妈妈照顾妹妹。Youmustn’tswimintheriver.你不准在河里游泳。Youdon’thavetodoitnow.你现在不必做这件事。注意:以must开头的一般疑问句,其肯定回答用must,否定回答用needn’t或don’thaveto。例如:—MustIfinishtheworknow?我现在必须完成这项工作吗?—Yes,youmust./No,youdon’thaveto.是的,你必须完成。/不,你不必现在完成。Ⅰ.根据句意用所给词的适当形式填空1. Do (d
4、o)theworkrightnow,Jim. 2.Please tell (tell)methenews. 3.Let’s play (play)soccernow. 4.Youmust come (come)toschoolontime. 5.No talking (talk)here! Ⅱ.根据句意用must或haveto的适当形式填空1.You must doityourself. 2.— Must Ireadthebookinthereadingroom? —No,you don’thaveto . 3.It’sla
5、te.Jim hasto gohome. 4.— Must Lilykeepquiet? —Yes,she must . 5.Youdon’t haveto getupearlyonweekends. Ⅲ.按要求完成句子,每空一词1.Youcan’tlistentomusicwhenyourmotherissleeping.(改为祈使句) Don’t listen tomusicwhenyourmotherissleeping. 2.Hehastobeinbedbyteno’clock.(改为一般疑问句) Does he
6、have tobeinbedbyteno’clock? 3.Youmustcomehereearlythisafternoon.(改为祈使句) Come hereearlythisafternoon. 4.Letherhelpyou.(改为否定句) Don’t let herhelpyou. 5.Shehastorideherbiketogohome.(改为否定句)She doesn’t have to rideherbiketogohome.
