Kim! Have you seen my cell? it was here somewhere.

No, but if I find it, I will let you know.

We use first type of conditional to talk about real actions that may or may not take place in the future.

if + base form of the verb + future simple

I am sorry, I don't. But If I had one, I would give it to you.

Kim, Do you have a ball?

We use the second type of conditional to talk about imaginary or unreal situations in the present.

if + Past Simple + would+base form of the verb

Oh, I knew that. But If you had studied more, you would have passed it.

Dad, I haven't passed the exam at school.

We use the third type of conditional to talk about unreal actions in the past.

if + Past Perfect + would have+Past Participle of the verb

Thanks for your time and attention.