What Will Happen?
Zero Conditional
Use the zero conditional if an action always occurs as the result of another action. The zero conditional is used to express conditions that are always true.
Example:
The funder delivers on time if the student keeps his grade point average high.
If we spend less than our operating budget, we always throw a big party."
The present simple is used in both the 'if' clause and the result clause.
'If' clause - present simple + , + result clause - present simple
The funder delivers on time if the student keeps his grade point average high.
If we spend less than our operating budget, we always throw a big party."
Do not use a comma, when placing the result clause first.
Our operational NGO implements development related projects if it can operate legally in the country.
First Conditional
Use the first, or 'real', conditional if an action will occur if something happens. The first conditional is used when a result is realistically possible.
'If' clause - present simple + , + result clause - future with will
We will ignore the consultant if she doesn't tell us what we want to hear.
If the Security Council passes this resolution for international humanitarian intervention, we will begin shipping supplies tomorrow."
Do not use a comma, when placing the result clause first.
He will file a complaint if Roger continues to feel he is the victim of intolerance and harassment at work.
'Unless' is also used in the first conditional to mean 'if not'.
If he doesn't come soon, we won't go to lunch = Unless he comes, we won't go to lunch.
Use of 'May' and 'Might' in the First Conditional
When a future result is not certain based on a condition, use 'may' or 'might'.
'If' clause - present simple + , + result clause - 'may / might' + verb
He will press charges if Sam uncovers a suspect through the investigation and documentation of the case.
We will ignore the consultant if she doesn't tell us what we want to hear.