如果后面加动词的话就要接不定式．如果是个形容词的话就可以不加．
举个例子,he seems to have learned abroad.他看起来好象在国外学习过
然后是形容词有关的he seems to be clever,这里有个be,即动词,所以就要加不定式．当然也可以改成he seems clever．形容词可直接跟在后面．
另外注意一下seem和appear的区别,seem是表里一样,而appear是表里不一