重读闭音节是指以一个辅音字母结尾的而且必须是重音所在位置的音节,在变现在分词或比较级时应该双写该字母.
应该说你所列举出来的这些词或词组都是情态动词或词组,变成疑问句时除了had better not需借助于助动词do之外其他的均可直接提前到句首.
may,can,should,needn't,must,had better not等后面跟动词原形的助动词提问时都是把
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