…If I had … If we went

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If he had the money, he would buy a fast car.

If he had the money, he would buy a car.
or He would buy a car if he had the money.

I don’t know the answer. If I knew the answer, I’d tell you.

It’s raining, so we’re not going out. We’d get wet If we went out.

Emily lives in a city. She likes cities. She wouldn’t be happy if she lived in the country.

If you didn’t have a job, what would you do? (but you have a job)

I’m sorry I can’t help you. I’d help you if I could. (but I can’t)

If we had a car, we could travel more.
(but we don’t have a car so we can’t travel much)

It’s not a very nice place. I wouldn’t go there if I were you.
(or… if I was you)

It would be nice If the weather was better. (or … If the weather were better)

What would Tom do If he were here? (or … if he was here)

I want to go and see Helen. If I have time, I will go today.
(= maybe I’ll have time, so maybe I’ll go)

I like that jacket. I’ll buy it if it isn’t too expensive.
(= maybe it will not be too expensive)

I’ll help you if I can. (= maybe I can)

I want to go and see Helen. If I had time, I would go today.
(= I don’t have time today, so I will not go)

I like this jacket, but it’s very expensive. I’d buy it if it wasn’t so expensive
(= it is expensive. so I’m not going to buy it)

I’d help you if I could, but I can’t.