The document discusses the three types of conditionals in English:
The first conditional refers to present and future possibilities. The if-clause uses the simple present and the main clause uses the future with "will".
The second conditional refers to unlikely present or future situations. The if-clause uses the simple past and the main clause uses "would" + infinitive.
The third conditional refers to unlikely past situations. The if-clause uses the past perfect and the main clause uses "would have" + past participle. It expresses something contrary to what actually happened.
2. FIRST CONDITIONAL
The first conditional refers to the present and future.
It expresses a possible condition and
its probable result in the future.
3. Jack wants to buy a house but he can’t do this
because he doesn’t have any money.
If I had a lot of money,
I would buy a big house.
SECOND CONDITIONAL
4. Susan wants to phone Paul but she can’t do
this because she doesn’t know his number.
If I knew his number,
I would phone him.
SECOND CONDITIONAL
5. If I had a lot of money, I would buy a big house.
If I knew his number, I would phone him.
if-clause:
PAST SIMPLE
main clause:
would + infinitive without to
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,
or imaginary.
6. THIRD CONDITIONAL
Jack wanted to buy a house last year but he
couldn’t do that because he didn’t have any money.
If I had had a lot of money,
I would have bought
a big house.
7. THIRD CONDITIONAL
Yesterday, Susan wanted to phone Paul but she
couldn’t do that because she didn’t know his number.
If I had known his number,
I would have phoned him.
8. THIRD CONDITIONAL
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
main clause:
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.
9. THIRD CONDITIONAL
If I had worked harder at school, I would have
got better grades.
If I had paid more attention in class, I would
have understood the lesson.
If you hadn't been late, we wouldn't have
missed the bus.