有老师说place, time 后不加介词。如 a place to live,而不是 a place to live in ,那英语书上出现了 a place you have been to,此时to为何不省呢?
不及物动词作place的后置定语时,该不定式后面可以不带介词,也可以带介词。例如:
There is no place to go. / There is no place to go to. 无处可去。
I want a place to sleep in. / I want a place to sleep. 我需要个地方睡觉。
(《薄冰英语惯用法词典》p.726)
所以,a place to live 和 a place to live in 都是正确的。
在place后面的定语从句中,与谓语动词后面的介词,也可以省略。例如:
We need a place (that) we can stay for a few days. 我们需要一个可以暂几天的地方。(但不能说:We need a house we can stay for a few days.)(《牛津英语用法指南》第三版498.6)
You remember the place we had lunch?(=...the place (that) we had lunch at? 或 …the place where we had lunch?)你记得我们吃午饭的地方吗?(《牛津英语用法指南》第三版431)
Why not go out and see if there’s some place we can dance? 为什么不出去看看是否有我们可以跳舞的地方?(《柯林斯COBUILD高阶英汉双解学习词典》p.1982)
所以,a place you have been to 中的to也可以省略。