Question

英语语法问题（时态和主被动）

英语语法问题（时态和主被动）i often heard this song sung by young people.
为什么sung不用被动，不是停年轻人唱歌，年轻人在唱的后面，我有点不明白。
希望知道的朋友能帮我分析下我错的地方，谢谢！

Answer 1

i often heard this song sung by young people.
句中sung by young people为宾语补足语，与宾语this song是被动关系。

追问

我还是不理解没有加be动词，形成be done 结构？

追答

过去分词作宾语补足语的用法:
(一)能够接过去分词作宾补的动词有以下三类:
1.表示感觉或心理状态的动词.如:see,watch,observe,look at,hear,listen to,feel,notice,think等.
(1) I heard the song sung in English.我听到有人用英语唱过这首歌.(过去分词sung的动作显然先于谓语动作heard;)
(2)_He found his hometown greatly changed.他发现他的家乡变化很大.(过去分词changed的动作显然先于谓语动作found)
2.表示"致使"意义的动词.如:have,make,get,keep,leave等.
(1) I'll have my hair cut tomorrow.明天我要理发.
(2) He got his tooth pulled out yesterday.他昨天把牙拔了.
(3) Don't leave those things undone.要把那些事情做完.
【注意】过去分词所表示的动作一定和宾语有逻辑上的动宾关系.
(二)使役动词have接过去分词作宾补有两种情况.
1.过去分词所表示的动作由他人完成.
(1) He had his money stolen.他的钱给偷了.(被别人偷去了)
2.过去分词所表示的动作由句中的主语所经历.如:
(2) He had his leg broken.他的腿断了.(自己的经历)

Answer 2

这是一个定语从句
完整的应该是I often heard this song that was sung by young people.
that was 可以省略