用who,whom或 which把以下每对句子改写成一句话.The car is expensive.he can not afford it.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.
问题描述：
用who,whom或 which把以下每对句子改写成一句话.The car is expensive.he can not afford it.
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