Anonymous“I wish there were someone who knows what I mean when..”
Actually, if I were you, I think I'd be just as concerned about the form of the other verbs in the sentence. I'd make them subjunctive as well. I would write the sentence this way:
- I wish there were someone who knew what I meant when...
Saying "I wish there were someone who knew" is not really much different from saying "I wish someone knew".
As regards the was/were issue, the use of "were" would be the more formally correct word to use. However, in informal everyday English the word "was" is very often used instead, and it has also been gaining some grammatical respectability.