not only......but also:婚前你不但要给我买钻戒还要给我买房。

You must give me not only the diamond ring but also a house before we get married

you must give me not only a diamong ring but also a house before marriage.

Not only would you buy me a diamond ring,but also to me a house before marriage.

婚前你不但要给我买钻戒还要给我买房。
You must buy me not only the diamond ring but also a house before we get/are married .
满意吧。