Is 是连系动词,在语法功能上和连词相当,起着联系前后单词的作用,比如 他18岁 he+is +18 她很漂亮 she is beautiful。 is 通常跟在主语后 ,is后面跟名词性成分或者形容词或者动词ing(表示现在进行). 第二步:再将疑问词置于上述一般疑问句的句首:what books does mr.li's daughter read at home in the evening?
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