I won't lend you the book before I have finished it.为什么用have finished
问题描述:
I won't lend you the book before I have finished it.
为什么用have finished
答
因为是完成时
答
用have
表示你【完成】的这个动作发生在【借出】的这个动作之前
强调时间的先后顺序
答
有 before 或 after 的句子,用完成时态或一般时态都可,无太大区别.这句用
before I finish it
也对.
答
前面有before