I used Past Simple

I used Past Perfect

I used Third Conditonal

I used Second Conditional

They would have arrive

They could arrive

They might arrived

They could have arrived

I would buy many cars

I would buying 100 cars

I would bought many cars

I would buyed 100 cars

didn´t studied informatics

hadn´t studied informatics

studied informatics

have study informatics

Second Conditional

Past Perfect

Future

Third Conditional

Past Participle.

Present Simple.

Second Conditional.

Third Conditional.

Past Continous.

Second Conditional.

Third Conditional.

Present Continous.

if + past simple, ...would + infinitive

if + present simple, ...would + infinitive

if + past perfect, ...would + have + past participle

if + present simple, ...will + infinitive

hypothetical situations in the present

hypothetical situations in the past

possible situations in the present and future

results that always happen

If I had had money, I might have gone to India or Japan for vacation.

If I had had money, I could have gone to India or Japan for vacation.

If I had had money, I would have gone to India or Japan for vacation.

If I have had money, I might have gone to India or Japan for vacation.