你应该注意到seem后的不定式为完成体。seem to have done sth.
注意下列句子的区别。
You are fat. 现在的状态
you were fat. 过去的状态
You seem to be fat. 现在的状语
You seemed to be fat. 过去的状态
You have put on some weight. 现在完成时表示过去的动作导致现在的结果。
You seem to have put on some weight. 比上句委婉,留有余地。
You put some weight during the summer vacation. 一般过去时表示过去的动作。
You seem to have put on some weight during the summer vacation. 现在看起来过去某个时间发生了某事。
It seems that you put on some weight during the summer vacation. 同上。
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