摘要:(1)肯定式:主语+be+v-ing+其它.如: He is mending his bike.他正在修自行车. (2)否定式:主语+be+not+v-ing+其它.如: He is not mending his bike.他没在修自行车. (3)疑问式:主要分一般疑问句和特殊疑问句两种句式. 一般疑问句:Be+主语+v-ing+其它?如: -Is he mending his bike?他正在修自行车吗? -Yes.he is. 特殊疑问句:疑问词+be+主语+v-ing+其它?如: -What is he doing?他正在干什么?

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