陈述句中有情态动词（can may must …）时，也可直接将它们提至主语前，即可成为一般疑问句。如： He can swim now． → Can he swim now？ The children may come with us． → May the children come with us？
2．陈述句中只有一个实义动词作谓语且其时态为一般现在时，变为一般疑问句时要在句首加do或does 主语后的实义动词用原形。如： I like these animals． → Do you like these animals？ She wants to go to the movies． → Does she want to go to the movies？
变否定就在情态动词/助动词后面加not
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