用关系代词将下列句子连成复合句：

题目

用关系代词将下列句子连成复合句：
the old man is a professor.he teaches chemistry in a college.
the man waved to us.the man was my uncle.
these are the presents.i bought them for my parents.

答案

郭敦顒回答：the old man a professor.he teaches chemistry in a college,a man are waved to us,man said these is the my uncle,i was bought them the presents,for the.my parents.