The students in class2 were seen to play basketball by us yesterday (改为主动语态）
网友回答
We saw the students in calss 2 playing basketball yesterday
======以下答案可供参考======
供参考答案1:
We saw the students in calss 2 play basketball yesterday.
供参考答案2:
We saw the students in Class 2 play basketball yesterday.
see sb.do sth看见某人做某事