Conditionals
ZERO CONDITIONAL (REAL IN THE PRESENT)
present simple + present simple
If I have enough time, I watch TV every evening.
FIRST CONDITIONAL (REAL IN THE FUTURE)
present simple + (will + verb)
If I have enough time, I will watch TV later on tonight.
SECOND CONDITIONAL (UNREAL IN THE PRESENT / FUTURE)
past simple + (would + verb)
If I had enough time, I would watch TV now or later on.
THIRD CONDITIONAL (UNREAL IN THE PAST)
past perfect + (would have + past participle)
If I had had enough time, I would have watched TV yesterday.