6.你知道他打算娶reason你的原因吗?

7.我讨厌hate我住过的那个旅馆hotel。

8.我永远也忘不了我们共同生活和学习的那个秋天autumn。

9.他爱了20年的那个女孩昨天嫁marry人了。

10.她是我见过的最漂亮的女孩。

答案:

6.你知道他打算娶reason你的原因吗?

Do you know the reason for which he is going to marry you?

Do you know the reason why he is going to marry you?

7.我讨厌hate我住过的那个旅馆hotel。

I hate the hotel where I lived.

I hate the hotel in which I lived.

I hate the hotel I lived in.

8.我永远也忘不了我们共同生活和学习的那个秋天autumn。

I will never forget the autumn when I studied and lived with you.

I will never forget the autumn in which I studied and lived with you.

9.他爱了20年的那个女孩昨天嫁marry人了。

The girl whom he had loved for 20 years married someone yesterday.

10.她是我见过的最漂亮的女孩。

She is the beautiful girl that I have ever seen.