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