The girl is standing besidde the window.she is a new student. There are the presents.
问题描述：
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
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）