祈使句表示请求、命令、叮嘱、号召等,谓语动词用原形;祈使句一般读降调,句末用”!”或”.”
如:Come in! Be careful!
1.普通祈使句的否定式以do not(通常缩写为don’t)或never(语气较强)引起。
如:Don’t be careless! 别粗心大意!
Never do that again! 再不要这样做了!
2.let的宾语是第一人称时,否定式为宾语后加not;
let的宾语是第三人称时,否定式常为let前加don’t。
如:Let’s not waste time! 咱们别浪费时间。
Don’t let them watch TV! 别让他们看电视了!
3.祈使句的主语you通常不表示出来,但如果要特别强调对方或表达某种情绪时可以有主语或呼语。
如:You be quiet! 你给我安静点!
Don’t you be late again! 你可别再迟到了!
Come in, everybody! 大家都进来吧!
4.“Do(或always)+祈使句”表示一种强烈的感情或请求等。
如:Do come on time! 务必要准时来哦!
Do sit down! 快请坐下!
5.Please是“请”的意思,可在句首也可在句末(在句末时常用逗号隔开),有时也可以在句中。
如:Please read the text. = Read the text, please. 请朗读这篇课文。
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