关于主语补足语的问题.
问题描述：
关于主语补足语的问题.
U are supposed to do sth.
这里to do sth是不是主语补足语,
A child was seen to enter the building.
to enter the building是主语补足语吗?
U will be helped to push the cart.
to push the cart.主语补足语?
答
以上都是主语补足语.主语补足语和宾语补足语可以这样加以区别：被动语态的主语补足语与主动语态的宾语补足语是密切相关的.例,(1) I saw him playing basketball yesterday.(2) He was seen playing basketball yeste...