Tipo 0 - General Truths - if in simple present - main clause in simple present
Tipo 1 - una posible condición y su resultado probable - if in simple present - main clause in simple future
Tipo 2 - una condición hipotetica y su resultado probable - if in simple past - main clause in present conditional or present continuous conditional
Tipo 3 - Una condición pasada irreal y su resultado probable en el pasado - if in past perfect - main clause in perfect conditional
Tipo 0 (real world, and often refers to general truths. Time now or always)
If + simple present - simple present
ex: if this thing happens, that thing happens.
if you heat ice, it melts.
if it rains, the grass gets wet.
if + simple present - simple future
ex: if this thing happens, that thing will happen
if you don't hurry, you will miss the train.
if it rains today, you will get wet
if + simple past - present conditional or present continous conditional
ex: if this thing happened, that thing would happen or that thing would be happening
if it rained, you would get wet.
if you went to bed earlier, you would not be so tired.
if i spoke italian, i would be working in italy
if + past perfect - perfect conditional or perfect continuous conditional
ex: if this thing had happened, that thing would have happened or that thing would have been happening
if you had studied harder, you would have passed the exam.
if it had rained, you would have gotten wet.
if i had accepted that promotion, i would have been working in Milan
Oraciones tipo 0:
If Bill phones, tell him to meet at the cinema
Ask Pete if you're not sure what to do
If you want to come, call me before 5:00
Meet me here if we get separated
If you freeze water, it becomes a solid
Plants die if they don't get enough water
If my wife has a cold, I usually catch it
If public transport is efficient, people stop using their cars
If you mix red and blue, you get purple
When it rains, the grass gets wet.