It's better than I thought 比我想象的要好。
例句：
Wow,you won the second 's better than I thought.
哇塞，你得了第二名，比我想象的好。
A：I can't believe your mark was the second highest in your class.
我不敢相信你的分数是班级第二高的。
B：I can't believe it 's better than I thought.
我也不敢相信，比我想象的要好。
A:What grade did you get in your math exam?
你数学得了多少分？
B:80%
80分
A:It's better than I thought.
比我想象的好。