应该是固定句式:lt seems that Bart is happy。it是形式主语，that从句是主语从句。
由“a lot of（lots of，plenty of, some of, most of，all of, none of）＋名词”作主语时，谓语动词的单复数形式取决于这个名词。如果是可数名词复数，则谓语动词用复数形式。如果是不可数名词，则谓语动词用单数形式。
例1：Lots of people have said that.
很多人说过这个了已经。
固定句式：it seems that Bart is happy
形式主语：it
从句主语：that
Bart seems happy. Bart seems like a child.
Sb seems adj. Sb seems like something.
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