1、 筋疲力尽，这个表达不太正式，多用于口语。

I‘m usually worn out at the end of the day. 　在一天快结束时我时常觉得很累。

2、 破旧不堪。

My soles were worn out after a long time trip.经过长时间的旅行，我的鞋底已经破旧不堪。

better

1、‘d better 最好是

I‘d better read one of the articles for the class. 我最好还是为上课读篇文章准备一下。

I think you‘d better find another partner. 我想你最好还是另找一个搭档吧。

2、make it better 让……更好

I‘d rewrite the last two paragraphs to make it better. 我已经重写了最后两段以使它更好。

3、be better 更好些

I told you it would be better for you if you took fewer courses during the first semester.

我告诉过你如果你在第一个学期少选一些课程会比较好一些。