在英文中，有很多常用的小词，比如 I'd ，但到底是I would还是I had，学习英文不能马虎，今天一次教给你!

I would

I would+动词原形

I'd see

I'd walk

I'd study

If I were you, I'd rather go.

如果我是你，我就去

If I were rich,I'd travel around the world.

如果我有钱，我就去环游世界

I had

I had+过去分词构成过去完成时

I'd seen

I'd walked

I'd studied

He'd already left when we arrived.

当我们到的时候，他已经走了

I felt absolutely certain that I'd seen her before.

我完全确信自己以前曾见过她