问题标题：
中考英语请教老师!youcan't/need'tbeserious.你不是开玩笑吧.能用need't关于情态动词,1.Wouldyoucometomybirthdaypartytomorrowevening?I'mafraidI(wouldn't还是can't.)Ihavetolookaftermysister.为什么不用can't
问题描述：
中考英语请教老师!youcan't/need'tbeserious.你不是开玩笑吧.能用need't
关于情态动词,
1.Wouldyoucometomybirthdaypartytomorrowevening?I'mafraidI(wouldn't还是can't.)Ihavetolookaftermysister.为什么不用can't.)
2.MayIputmybikehere?No,you(couldn't/-mustn't).youshouldputitoverthere.
为什么不用couldn't
刘楠回答：
youcan'tbeserious.很口语化换成need't意思变成,你不必如此严肃.第一个是不能,不可以.can一表能力,二表允许第二个是不需要.need需要无强制性.通常和must、haveto一同考察考点1：以must（有强制性且主观)引...
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