but what would happen if we cut down all trees in all forests to do these things or if we didn't save some and lant something else. 可以帮我翻译一下这句话吗 再详细讲讲结构和成分 谢谢。
what would happen 是主句 if we cut down all trees in all forests to do these things or if we didn't save some and lant something else. 是条件从句 对现在事实的虚拟,从句时态一般过去式,主句would+动原