I could use ___

[soso]

I could use (something)

You say "I could use ___" to indicate that you really want or need something, like a drink, but for some reason you haven't been able to get it yet. In the example at top, you say "I could really use a cup of coffee" because you're very sleepy and need some coffee, but there's no coffee nearby.

사용할 수 있을텐데라는 말은 정말로 필요하다는 말이나 아직은 사용할 수 없다는 의미다

Here's another example - when you're struggling with something, and there's someone nearby who isn't helping you, you can say:

I could use a little help.

A similar phrase is "I could go for ___." Only use this to talk about things that you suddenly want, like food or drinks:

I could go for a beer right now. You want one?

* "Could" is used to express possibility or past ability as well as to make suggestions and requests.

"Could" is also commonly used in conditional sentences as the conditional form of "can."

could 가 can 의 과거형일 경우 과거의 능력을 의미하나

가정법으로 쓰일 경우는 제안이나 요구 또는 조건을 의미하기도 한다