do ,does是助动词.情太动词有(二)情态动词的种类:
原 形x09过去式x09词 义
canx09couldx09能
mayx09mightx09可以(或许)
mustx09must(had to)x09必须(不得不)
willx09wouldx09愿意
shallx09shouldx09应该
needx09neededx09需要
darex09daredx09敢于
(三)情态动词的否定形式:
cannot --- can’t could not --- couldn’t may not--- mayn’t
might not--- mightn’t must not --- mustn’t will not --- won’t
would not --- wouldn’t need not --- needn’t shall not --- shan’t
should not --- shouldn’t ought not --- oughtn’t dare not --- daren’t