We use the first conditional to talk about possible situations in the present or future and say what we
think the result will be.
We often use if and the present simple to describe the
possible action or event.
If he doesn't email me, I won't speak to him again.
We use will/won't + infinitive when we are sure of
the result.
If we don't leave now, we won't catch the 8.30 bus.
We use may/might (not) to show we are less sure
about the consequence
If she sees you, she might leave.
We use be able to to talk about possible abilities.
I'll be able to buy it if I save the money.
When we use if to start the sentence, we use a
comma between the two parts.
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