He seems to be ill.=It seems that he is ill. 他好像有病.
He seems to have been ill.=It seems that he was [has been] ill. 他好像得了病.
I seem to see him still. 我觉得似乎仍看到他的身影.
It seems so.=So it seems. 好像是这样.
It seems you were lying. 你似乎在说谎.
It seemed as if she would recover. 当时她好像会好起来.
There seems no reason to do it. 似乎没有理由做这事.
He seems young. 他看起来很年轻
I seem unable to finish this book. 我好像读不完这本书.