—Must I finish the job before nine tonight?
—Yes,you must.
—No,you needn’ t./don’t have to.
③must还可以表示猜测,意为“一定”“肯定”,只用于肯定句中,否定句用can’t.
He must be at home.The lights are on.
He can’t be /come from England.
He doesn’t speak English.
4.shall,should和ought to
①征询对方的意见或主动提出干某事。
Shall I get some chalk,Mr.Black?
Shall he come in now ?
②shall用于第二、三人称陈述句中时,表示说话人命令/警告/强制/允诺等语气。
You shall do as I say.
Tell him that he shall have the book tomorrow.
③should表“劝告”“建议”,译作“应当”,常表示主观看法。还可表示必要/惊奇/遗憾等语气,译为“应该,竟然会”。ought to 语气比should稍重些,可表示“义务”“要求”“劝告”,译作“应当”,常表示客观情况,否定形式为ought not to,疑问式为ought I /he to…?You should keep your promise.
Can you imagine that a well-behaved gentle-man should be so rude to a lady?
If he started off on time,he ought to be here now.
5.will和would
①will表“意愿”,可用于各种人称。
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