高一英语：They must have played computer games for several hours,didn't they?

they must have played computer games for several hours, haven't they?
他们肯定玩了几小时的电脑,不是么?
提问用的是完成时,所以反问也用完成时

如果反问要用一般过去式的话,应该是
they must played computers ,didn't they?他们肯定玩过电脑了,不是么?

但是此句有for several hours,所以只能用完成式,只能改反问部分而不能把前面的完成式改掉

错误点，前后时态不一致
逗号前使用的是一般现在完成时态，而逗号后用的则是一般过去时
注意：一句句子（不包括状语从句）是不容许出现2种时态。
所以正确的改法为：they must have played computer games for several hours, haven't they?

They must have been playing computer games for several hours,weren't they?

上边说的都不错