seen和seem是什么意思 他们都有什么固定搭配? 像seen to do这样的

seem 似乎
seen 看到

seen 是see的过去分词 也有形容词看得见的意思 seem是情态动词 似乎，好想的意思 seem to do something ，seem about to ,seem like ,seem to be ,seem to meet before.

seen是see 的过去分词.see sb.do sth.看见某人做某事.（动作结束或习惯动作）
We see her sing songs every day
see sb.doing sth.看见某人正在做某事.We see her singing songs now
seem.1）系动词seem+形容词.He seems happy
2).不及物动词 seem to do sth.或It seems that 从句
He seems to know everythng
It seems that he is happy

seen是see（看见）的过去分词，be seen 就是被看见，没什么固定搭配，就是see的一般用法
如果(be) seen to do 就是被看见做什么了，但是一般不这样使用，被看见正在做什么的用法多一点：He is seen drinking beer. 他被看见正在喝啤酒。
seem是看起来，似乎的意思，It seems that 句型，看起来怎么怎么样，It seems that you don't believe me. 看起来你不相信我。直接用也比较多见，He seems unhappy. 他看起来似乎不高兴了。