What Is Fist Conditional?
First conditionals are statements about plans that are possible to happen in the future. They consist of an 'if clause' that shows the possibility and the 'main clause' that is the result.
You can change the order of the clauses and the meaning of the statement will be the same.
The formula of the first conditional is:
If the book store
Always remember to put a comma when the statement begins with the 'if clause'.
When you state the result before the "if clause", bear in mind not to add a comma to the sentence.
There will be famine
The first conditional is used to show the possibility of an event and its result in near future.
Zero Conditionals vs. First Conditionals
The main difference between these two is that you must use a modal verb such as (will, should, can,...) in the main clause. Also, the zero conditional is used when you want to state a fact, but the first conditional is used to talk about the possibility of an event in the future.
Here is an example of first conditional because it's about a possibility in the future and we have a modal verb (will) in the result clause.
This is an example of the zero conditional because both tenses are present and it's stating a fact.