beforehand
英
/bɪˈfɔːhænd/
美
/bɪˈfɔːrhænd/
adv.
预先，事先；提前，超前
adj.
预先准备好的；提前的，赶在前面的
记忆技巧：before prep.，conj.，&adv.在…之前 + hand n.手
例句
I wish we'd known about it beforehand.
要是我们预先知道这事就好了。
It is reasonable to assume that he knew beforehand that this would happen.
有理由认为他事先就知道会发生这样的事。
How could she tell beforehand that I was going to go out？
她怎么会事先知道我要出去？
