abbr.you had 你已经;you would 你应该;
例句:
How was I to know you'd return so suddenly?
我怎么知道你会这么突然就回来?
You'd think you had never seen a door before!
就好像你以前连门都见过一样!
You'd better run if you're going to get your ticket.
想买到票的话,你最好跑几步。