It is not hard to repair the bookcase.____I need is hammer and several nails.
问题描述：
It is not hard to repair the bookcase.____I need is hammer and several nails.
为什么选all而不选something、both、everything
答
All 表示我所需要的一切.修书架并不难,我所需要的只是一把榔头和一些钉子.
如果选择其他的,意思就不通了.