We have been waiting since 8.00(改为否定句） she has been reading for an hour（对for an hour提问）He has been running since i arrived（对since I arrived提问）谢谢了这些句型转换

We have been waiting since 8.00(改为否定句） she has been reading for an hour（对for an hour提问）He has been running since i arrived（对since I arrived提问）谢谢了这些句型转换
We have been waiting since 8.00(改为否定句） she has been reading for an hour（对for an hour提问）
He has been running since i arrived（对since I arrived提问）
谢谢了这些句型转换

We have been waiting since 8.00(改为否定句） she has been reading for an hour（对for an hour提问）He has been running since i arrived（对since I arrived提问）谢谢了这些句型转换
We haven't been waiting since 8:oo.
How long has she been reading
How long has he been running

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for an hour提问） How long has she been reading ?

We haven't been waiting since 8:00.
How long has she been readning?
How long has he been running?/Since when has he been running?
如果用when是不妥的，因为when常用语一般过去时。

很高兴为你解答！
老师祝你学习进步！
请及时采纳哦！多谢你的问题！^_^

We have been waiting since 8.00(改为否定句）We have not been waiting since 8:00.
she has been reading for an hour（对for an hour提问）How long has she been reading?
He has been running since i arrived（对since I arrived提问）When has he been running?