如果一个动词后带的是复合宾语（宾语+宾补），若需将其变为被动句，其方法是：把主动句中的宾语改为主语，而宾语补足语保留在谓语动词后面成为主语补足语。如：
They chose Tom captain. 他们选汤姆为队长。
→Tom was chosen captain. 汤姆被选为队长。
I found him lying on the floor. 我发现他躺在地板上。
→He was found lying on the floor. 他被发现躺在地板上。
注意，在主动语态中，用于动词see, watch, hear, notice, listen to, look at, make, feel等后作宾语补足语的动词不定式都不带to，但改成被动语态后要加上to。如：
People saw him enter the building. 人们看见他走进大楼。
→He was seen to enter the building. 有人看见他走进大楼。