could do with sth
（表示需要或希望有）想要，需要
used to say that you need or would like to have sth; to need or want something
可以把这个结构理解为一个习语来记忆和运用，这样比较好容易理解。有时还表示一种语气。
I could do with a drink!
我真想喝一杯！
Her hair could have done with a wash.
她的头发该洗一洗了。
Your hair could do with a cut.
你该理发了。
We could do with a break. 我们该休息一会儿了。
I could do with a haircut. 我该理头了。
Do you feel like you could do with a change?
你想不想改变一下？
The range could do with being extended.
范围需要扩展。
I could do with a cup of tea
我需要一杯茶。
I could do with a drink. 我想要喝点酒。
Television advertising could do with a boost.
电视广告确实需要给力一把。
We could all do with a cup of tea
要是能给我们都来杯茶就好了。
The London investment bank could do with more support.
伦敦投资银行需要更多的支持。
I could do with another helping of porridge.
我想再喝一碗粥。porridge [ˈpɔːrɪdʒ] n.麦片粥;面糊;粥
You look as if you could do with a good night's sleep.
你看来似乎需要好好睡上一夜。
It looks like you can do with some help. 看来你需要些帮助。
They are tired of him now, but the race could do with some of the star power he used to have.
现在，虽然选民们对他早已厌倦，但是竞选多少还需要一些他曾有过的名人效应。
This place could do with a good cleaning.
这儿需要好好打扫了。
I could do with a change of scenery.
我想要换一个地方（环境）。
The essays could do with a flash of wit or humor. 这些散文需要一些出其不意的风趣或幽默。
I could do with a bath. 我想洗个澡。
We could do with a new car. The one we have got is a bit too old.
我们需要一辆新车，我们现在的那辆太旧了。
I could do with a simple lunch.我想要一份简单的午餐。
I could have done with some help this morning.
今天怎么没人来帮我啊？（一种婉转的批评或发牢骚）
注意：
1.can do with 将就，凑合……
can do without 没有…也行,将就
Can you do with cold meat for dinner？
晚上你凑合着吃点冷的熟肉行吗？
2. can't/couldn’t do with 意思是“不能做某事，无意做某事，忍受不了某事”。
He couldn't do with waiting any longer, so he left. 他等不下去, 所以走了。
I couldn't do with another dancing.我不能再跳舞了。
She couldn't do with noise and disturbances any longer, and left. 她再也受不了吵吵闹闹, 于是走开了。
I can't do with his insolence. 我忍受不了他那傲慢无礼的态度。