OVERIEW OF BASIC VERB FORMS USED IN CONDITIONAL SENTENCES

SITUATION
True in the present / future
IF – CLAUSE
Simple present
RESULT CLAUSE
Will + simple from
EXAMPLES :
If I have enough time, I watch TV every evening.
If I have enough time, I will watch TV later on tonight.

SITUATION
Untrue in the present / future
IF – CLAUSE
Simple past
RESULT CLAUSE
Would + simple from
EXAMPLES :
If I had enough time, I would watch TV now or later on.

SITUATION
Untrue in the past
IF – CLAUSE
Past perfect
RESULT CLAUSE
Would have + past participle
EXAMPLES :
If I had had enough time, I would have watched TV yesterday.

Sumber : English Grammar trird edition, betty schrampfer azhar.