Tina has already cut down the trees and build a house 变否定句
问题描述：
Tina has already cut down the trees and build a house 变否定句
and用不用变or?
答
否定句：Tina hasn't cut down the trees and build a house yet.
and不用变or,砍树和盖房子有先后顺序,or就没有先后顺序了.