The girl is standing besidde the window.she is a new student. There are the presents.

题目

The girl is standing besidde the window.she is a new student. There are the presents.
用who，whom或which把以下每对句子改写成一句话。
The girl is standing besidde the window.she is a new student.
There are the presents.I bought them for my parents.
This is the old man.I helped him the day before yesterday.

答案

每个句子都可以改成定语从句：
The girl who is standing beside the window is a new student.(girl 在从句中做主语)
There are the presents which I bought for my parents.（presents在从句中作宾语）
This is the old man whom I helped the day before yesterday.（old man 在从句中做宾语,所以用whom）