A conditional sentence is composed of an if-clause and a main clause. The if-clause comes first and is followed by a comma. There are three types of conditional sentences: conditional zero uses the present tense in both clauses to describe scientific facts or universal truths. The first conditional uses the present tense in the if-clause and future simple tense in the main clause to talk about possible future situations. The second conditional uses the past tense in both clauses to talk about hypothetical or unlikely situations.

1. How to make
Conditional
Sentences

2. A conditional sentence is composed of :
IF clause + Main
Clause
Example:
IF Clause Main Clause
If it rains tomorrow,
We will not come.

3. The order of the
two clauses may
change, BUT when
the
If-Clause comes
first, IT MUST BE
FOLLOWED BY A
COMMA
 If it rains, I’ll stay
at home.

4. Conditional
Zero
It is used when the result of the condition is
ALWAYS TRUE, such as a scientific fact or
universal true.
 The structure has to have PRESENT TENSE in both
clauses.
Present Tense Present Tense
It boils.
If you heat water to 100°C,
If you pour oil into water,
It floats.

5. First Conditional
It is used to talk about situations which might
happen in the future, in other words, it describes
occurrences which could easily come true.
 The structure has to have Present tense in the IF
clause and Future Simple* in the second clause
Present Tense Future Simple Tense
If I feel sick tomorrow,
If it rains,
I will not go to school.
the match will be cancelled.