1.改變   v.

On second thoughts, she changed her mind to live with her parents.

進一步考慮後，她改變主意跟父母住在一起。

2.變化 v.

Do you see the leaves in fall　change from green to brown ?

你看到秋天的樹葉由綠變成褐色嗎？

3.改變一下 n.

I think a change on hair style might do you good.

我想，換個髮型也許對你有好處。