I was teaching first and second conditionals to an intermediate English class the other day, and then we started with 'wish' statements.
We talked about famous people and their wishes. For example: 'Barack Obama wishes the USA didn't have such a high unemployment rate.'
And then we continued with the lesson and I introduced 'wish' statements with would. My example was 'I wish my daughter would do better at school'.
Then a student asked me what the difference between 'I wish' with 'did' or 'didn't' and 'I wish' with 'would' or 'wouldn't' was.
I said the difference was tense, if I say 'Barack Obama wishes the USA didn't have such a high unemployment rate', it's present tense.
If I say 'Barack Obama wishes the USA wouldn't have such a high unemployment rate.' It's incorrect, I think it would be better if I said : 'Barack Obama wishes the unemployment rate would improve in the USA.' , future tense.
And with the daughter example,'I wish my daughter would do better at school.', means that I hope she will improve in the future, and when I say 'I wish my daughter did better at school.' does that mean right now she is doing badly, and I want it to change today? Or does it mean that I don't think it will change?