UC知道变疑问句和否定句？
来源：百度知道 编辑：UC知道 时间：2024/05/17 05:59:17
She is waiting downstairs.最好简单讲一下.
is she waiting downstairs? 系动词is前置，加上问好，通常能把很多肯定句变为疑问句。
she is not waiting downstairs.在系动词后面加not，通常就会是否定句了。
Is she waiting downstairs? 陈述变疑问句的话把be动词提前。
Yes,she is./No,she isn't.
She isn't waiting downstairs.在be动词后加not
Is she waiting downstairs?
She isn't waiting downstairs.