题目

please be quiet.变否定句 please stand in line.变否定句 don t stamp your,please.变肯定句
please don t walk on the grass.变肯定句
快

提问时间：2020-11-02

答案

1.若原句中有动词be原句中含有be动词(am,is,are,was,were) 和助动词(have,has,had) 和情态动词(can,shall,will,may,should,would,might,had better等)时,要在动词后直接加not.如：His mother has already called the...