THE ZERO CONDITIONAL

We can make a zero conditional sentence with two present simple verbs (one in the 'if clause' and one in the 'main clause'

If + present simple, .... present simple.

This conditional is used when the result will always happen. So, if water reaches 100 degrees, it always boils. It's a fact. I'm talking in general, not about one particular situation. The result of the 'if clause' is always the main clause.

The 'if' in this conditional can usually be replaced by 'when' without changing the meaning.

For example: If water reaches 100 degrees, it boils. (It is always true, there can't be a different result sometimes). If I eat peanuts, I am sick. (This is true only for me, maybe, not for everyone, but it's still true that I'm sick every time I eat peanuts)

Speaking of clauses

The conditional zero formulation in English involves two clauses. The first clause, known as the si
clause

(the clause that starts with if) or the conditional
clause

(the conditional clause), introduces a condition. The second clause, known as the main one
clause


(the main clause), introduces a possible result of the conditional clause.

Here are some more examples:

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To refresh the memory

A clause  is defined as a set of words that form a complete sense.

A simple sentence like I am a student  (I am a student.) It has a clause.A complex sentence like I am a student, but she is a teacher (i am a student,but she is a teacher)It has two clauses.

https://www.youtube.com/watch?v=PDtUTAwMGDQ