问题描述：
1 they are students.they are playing football on the playgrou
2 those are the people.you met them on the street yesterday.
3 she is mary .you saw her in the street.
4 he is our english teacher. he came yesterday.
5 this is the professor.he taught me chemistry in 1980.合成定语从句
2 those are the people.you met them on the street yesterday.
3 she is mary .you saw her in the street.
4 he is our english teacher. he came yesterday.
5 this is the professor.he taught me chemistry in 1980.合成定语从句
问题解答：
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