Conditional ZERO: if + present, subject + present / imperative

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Things will happen or are true.

Zero Conditional: If + present simple, … present simple.
We make a zero conditional sentence with two present tenses verbs.
« if clause » and « main clause » with a present tense.

Zero Conditional: used when the result will always happen.
If water reaches 100 degrees, it always boils. It’s a fact.
We are talking about a general situation, not about one particular situation.
The « if clause » has always a result in the main clause.

With ZERO Conditional, we can replace « if » by « when ».
It doesn’t change the meaning. We’re talking about something which is true.
=> If (When, Unless) + Present, … Present simple (or imperative).
If you have any problem, tell me.
If you come to the office, give me a call.
When you finish, tell me.

« unless » = « if not ».
Unless you need more time, you tell me.
Unless you’ve seen him, you don’t tell him.

In the « if clause », we can use all present forms.
In the « main clause », we use only the present simple and imperative.
If you visit Paris, please send me a postcard.
If it’s raining, don’t forget your umbrella.
If you’ve finished this work before 4 o’clock, go back home.
When I’m working, don’t disturb me
When you go to the concert, don’t forget your ticket.
When I’ve finished my work, I show it to my supervisor.

We use the ZERO Conditional about things true, or about something that happen. (we’re sure).
If water reaches 100 degrees, it boils.=> it’s true, it’s a fact. (general situation).
If you want some help, I help you. => It’s going to happen, only here. (particular situation).