The sign on the birds' cage means we should keep quiet 否定句
问题描述:
The sign on the birds' cage means we should keep quiet 否定句
答
有2种否定方式:
一是否定主句
The sign on the birds' cage doesn’tmean we should keep quiet
二是否定从句:
The sign on the birds' cage means we should not keep quiet
第一种更符合要求