With zero conditional
we express a general truth or we give advice.
If clause: PRESENT SIMPLE
Main clause:
PRESENT SIMPLE or IMPERATIVE
The first conditional refers to the present and future.
It expresses a possible condition and
its probable result in the future.
If clause: PRESENT SIMPLE
Main clause:
FUTURE SIMPLE
If I had a lot of money,
I would buy a big house.
SECOND CONDITIONAL
If I knew his number,
I would phone him.
SECOND CONDITIONAL
if-clause:
PAST TENSE SIMPLE
main clause:
PRESENT CONDITIONAL
would + infinitive
SECOND CONDITIONAL
The second conditional refers to the present and future.
It expresses an unreal situation and its probable result.
The situation or condition is improbable, impossible,
imaginary, or contrary to known facts.
If John runs fast, he will win the race.
If John ran fast, he would win the race.
This is still possible to happen.
This is unlikely to happen because John doesn’t run fast.
If I had had a lot of money,
I would have bought
a big house.
If I had known his number,
I would have phoned him.
if-clause:
PAST PERFECT SIMPLE
main clause:
PAST CONDITIONAL
would + have + past participle
The third conditional refers to the past and
it is not based on facts. It expresses the a situation
which is contrary to reality in the past.
If I saw a car accident, I would call an ambulance.
If I had seen a car accident, I would have called an ambulance.
But I don’t see an accident now. This is unlikely to happen.
But I didn’t see an accident yesterday.
This is contrary to the fact in the past.
1. If he drives carefully, he will avoid the accident tomorrow.
This is still possible to happen.
2. If he drove carefully, he would avoid the accident today.
But he doesn’t drive carefully. This is unlikely to happen.
3. If he had driven carefully, he would have avoided the accident
yesterday.
But he didn’t drive carefully, so he didn’t avoid the accident.
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