Tell me about it!: used to say that you understand what somebody is talking about and have had the same experience 你算说对了; 的确

A: My teacher's so cruel... I can't believe how much homework I have!
B: Tell me about it! I barely even have time to sleep anymore.
我的老师太过分了……难以相信居然布置了这么多作业!
就是说嘛!我都快没时间休息了.

A:I get so annoyed with Steve!
B:Tell me about it. He drives me crazy.
史蒂夫把我烦透了!
你算说对了.他快把我逼疯了.

Not up to scratch: 不符合要求,不达标准

A: Have the workmen finished repairing your roof yet?
B: Well, they said they had finished it last week, but I had a look at it and their work wasn't really up to scratch, so I'm making them redo it.
工人把你的房顶修好了吗?
呃,他们说上个星期就修好了,但我看过了,他们的工作不符合要求,所以我让他们返工.

bring somebody/something up to scratch 令某人/物达到令人满意的程度

It'll take months to bring the band up to scratch. 得几个月工夫才能使乐队像个样子.