we must save the trees and not buy things made of ivory.中的“ buy t_英语解答

we must save the trees and not buy things made of ivory.中的“ buy things made of ivory”是一个含实义动词的句子,ok?变否定句需要借助助动词don't,ok?但现在只有一个not,do呢?

人气：175 ℃　时间：2020-02-05 16:25:02

解答

首先,这是and连接的两个谓语部分在时态和语态上要保持一致；再看前一个句子we must save……（情态动词must）,and后一句话完整的否定句应该是we must not buy……,为了避免重复简洁美观,就成了你看到的这个句子啦