We don't see you very often because you live so far away.
If you lived closer, we would see you more often.

It’s a nice book but it’s too expensive, so I’m not going to buy it.
I would buy it if it were cheaper.

We don’t go out very often – we can’t afford it.
We would go out if we could afford it.

We would see you more often.
(This line already has the suggested response filled in.)

I can’t meet you tomorrow – I have to work late.
If I didn’t have to work late, I could meet you.

It would be nice to have lunch outside but it’s raining, so we can’t.
If it weren't raining, we could have lunch outside.