seem to do sth 是宾语吗

不是，是系表结构

seem to do sth 意思是“好像，大概，似乎……”

比如：

They seem to know what they're doing.

看来，他们知道自己在干什么。

I seem to have left my book at home.

我大概是把书忘在家里了

seem的用法：

1、Sb./sth. + Seem + adj.（某人/某事+Seem+形容词）

如：be 不定式

The math problem seems (to be) very difficult to work out. 这道数学题似乎很难解决。

I seem to have caught a cold. 我似乎感冒了。

Tom seems (to be) a very clever boy. 汤姆看上去是一个非常聪明的男孩.

4、seem+过去分词

Our teacher seemed stopped by the question.我们的老师似乎是被那个问题难住了。

His story seemed revealed.他的谎言似乎已被揭露。

5、seem+ doing 现在分词

No one seemed thinking that way.似乎没人那样想。

She seemed lacking of enthusiasm when we were talking about that film. 我们谈论那部电影时，她看来好像没多大热情。