He wasn't cleaning the classroom at this time last night.
Was he cleaning the classroom at this time last night?
He wasn't cleaning the classroom at this time last night, was he ?
He was cleaning the classroom at this time last night, wasn't he ?
以上增加了两个反义疑问句供参考。
一般疑问句是直接把Was提到句子开头
即 Was he cleaning. ...?
否定句在was后面加not 疑问句Did he cleaning…
He wasn't cleaning the classroom at this time last night
Was He cleaning the classroom at this time last night
1、否定句:
He wasn't cleaning the calssroom at this time last night .
2、一般疑问句:
Was he cleaning the classroom at this time last night?