Bob did some cleaning in his office yesterday.(否定句)快
问题描述：
Bob did some cleaning in his office yesterday.(否定句)
快
答
Bob didn't do any cleaning in his office yesterday.
否定句要在Be动词后加not，情态动词后加not，实意动词前加not.过去式加did not 动词
答
Bob didn't do any cleaning
答
Bob didn't do any cleaning in his office yesterday.