句子改写We have been waiting since 8:00.(改为否定句)She has been read

We have been waiting since 8:00.(改为否定句)
We haven't been waiting since 8:00.
She has been reading _for_ an_ hour_(对划线部分提问)
How long has she been reading?
He has been runing _since_I_arrived___(对划线部分提问)
How long has he been running?
He skated at _9:00_yesterday(对划线部分提问)
When did he skate?
望采纳,多谢了!

We haven't been waiting since 8:00. how long has she been reading？
how long has he been runing？ when did he skate yesterday？

正
1、We have been waiting since 8:00.(改为否定句)
We haven't been waiting since 8:00.
2、She has been reading _for_ an_ hour_(对划线部分提问)
How long has she been reading?
3、He has been runing ...