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

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