davidxu_0926
花朵
共回答了21个问题采纳率:100% 举报
1. He is often seen to play the piano after school.
2.He often hears them sing songs next room.
解析:这些动词真奇怪,主动语态省略to,被动语态to 回来.还有以下动词也一样:watch,help,let ,hear,see ,notice等see sb do sth 变为be seen to do sth 也可以记住是固定结构
1年前
10