非谓语动词to be done和doneA new library is being built in our school and it'll be accessible to us students when(completed)next year.为什么不用to be completed?时间是next year应该用表将来啊
问题描述：
非谓语动词to be done和done
A new library is being built in our school and it'll be accessible to us students when(completed)next year.为什么不用to be completed?时间是next year应该用表将来啊
答
when引导,现在表将来呀
答
省略了（it is ），原型是it is completed.在英语表达中这种省略的用法非常常见。
答
完整版是it'll be …… when it's completed next year.在时间状语从句中,用用一般现在时表将来 （本题中when 引导的是时状从句）当从句和主句主语一致时,从句可省略主和系动词,本题即省去it‘s