2、1〉be(am/is/are)+主语+…?Yes,+主语+be No,+主语+benot.〈2〉Can+主语+动词原形+…?Yes,主语+can No,主语+can’t〈3〉Do/Does+主语+动词原形+…?Yes,主语+do/does No,主语+don’t/doesn't练习:写出下列动词的三单形式take be like play swim run do go watch wishthink eat have want study help learn teach start将下列句子改为一般疑问句,并作肯定和否定回答: