Question

for about an hour用于什么时态？

Answer 1

for about an hour用于多种时态，例如,一般过去时、现在完成时、现在完成进行时等等。
①一般过去时，如：They talked for about an hour.
②现在完成时，如：He has been here for about an hour.
③现在完成进行时，如：We have been walking for about an hour.

Answer 2

for about an hour大约一个小时
可以用现在完成时态，或者说一般过去时态。
例如：
I have been here for about an hour
For about an hour I sat with the group.
我跟猩群坐在一起大约有一个小时。

Answer 3

一般用过去式
例如 The old woman sat still for about an hour。老妇人坐了大概一个小时。