Conditional

0 CONDITIONAL
If(conditional,=cause) + simple present + present (effect)
Example: If you go, i go.

If/Clause|Main Clause.
If/When + Simple present + Simple present

If/When you heat water, it boils.
Use: to express a general truth or scientisfic fact. In this type conditional, we can use when instead of if.
When the if-clause precedes the main clause, we can use a comma to separate the two clauses. Compare:
If you heat water, it boils. Water bouls if you heat it.


1st CONDITIONAL
f(conditional=Cause)+ do or doesn't(present)+ future.
Example: If i work tomorrow i will see my boss.

If + simple present -->will + base form of main verb.
If we keep cutting down trees, animals will lose their habitat.
Use: To talk about a possible situation in the present or future.
Animals will lose their habitat if we keep cutting down trees.
Note: Unless=If not.
Compare the examples
Unless we stop cutting down trees, animals will lose their habitats.
If we don't stop cutting down trees,....