Second conditional

Second conditional sentences: if + past simple, would/wouldn't + infinitive
Use the second conditional to talk about a hypotetical/imaginary situation in the present or future and its consequence.
Compare:
Real situation: I don't have much money, so I can't buy a bigger house.
Hypotetical situation: If I had money, I'd buy a bigger house.
Use the second conditionals beginning If I were you, I'd ... to give advice. Here you can't use If I was you.

Would / wouldn't + infinitive
You can also use would / wouldn't + infinitive (without an if clause) when you talk about imaginary situations.
My ideal holiday would be a week in the Bahamas.
The contraction of would is 'd.

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Remember the difference between first and second conditional:
If I have time, I'll help you. A possible situation. I may have time.
If I had time, I'd help you. An imaginary/hypotetical situation. I don't / won't have time.