They have been given two tickets for the new play at the Gra

at the Grand Theatre可以看做the new play的定语，“大剧院的新戏剧”。 How many tress主语 have been planted谓语 this year状语？ Mary主语 was asked谓语 to show me her new book主语补足语. The mokey主语 was seen谓语 to jump off the tree主语补足语. 后两个句子结构比较类似，都是“动词+ sb to do sth“的被动，主动语态中to do sth补充说明宾语sb，叫宾语补足语，被动语态中to do sth仍然是补充说明sb，但是sb成主语了，所以就叫主语补足语了。