两句英语句子的问题It'squiteaspecialone,sir,soitdoesn'tsellcheap.It'sveryold,sir.Itbelongedtoagreatmanmanyyearsago.Socan'tsellitcheaply.为什么上面一句句子用的是CHEAP下面一句是CHEAPLY

Question

两句英语句子的问题
It's quite a special one,sir,so it doesn't sell cheap.
It's very old,sir.Itbelonged to a great man many years ago.So can't sell it cheaply.
为什么上面一句句子用的是CHEAP 下面一句是CHEAPLY

Answer 1

sell cheap 是系表结构,cheap 作为形容词,是系动词sell的表语；
sell it 动宾结构,副词cheaply做宾语it的补语.