Is it an idiom?

[cowboymathu]

Is this sentence "I wish I could" an idiom? I could not find this in the idiom dictionary. If not let me know how these kind of sentence are called..

[Sorinka]

No, it's not an idiom. It's just a nice expression. like this for instance : "I wish you were here"

[Anna Xpomoba]

"I wish I could do" = "I regret that I can't do"

it is not an idiom, it's grammatical structure

[cowboymathu]

Thanks guys. I was struggling with this but now it is alright.