Zero Conditional Sentences
In this type of conditional sentences we can use many different tenses.
If you are right, I am wrong. - In the if-clause and the main clause we use present tense.
If the ground is dry, don't forget to water our plants. - In the main clause we have used the imperative.
If you should be passing, come and see me. - We express here something depending on chance.
If you get this right, I shall have answered every question correctly. - We have used here Future Perfect Tense.
If you should meet him, tell him I must see him.
All the above sentences are open conditions. The speaker doesn't know whether the condition is or isn't the effect.
If I said this, I apologize.
If I made a mistake, I will try to remedy it.
If I have made a mistake, I will try to remedy it.
Neutral type conditionals
You have the same tense in both clauses: in the if-clause and the main clause.
If you take a raisin and soak it, it swells. It always happens like that.
If the wind blows from the north, this room is very cold.
If / When the wind blew from the north, we moved to the other room.
If / When the weather is fine, we have our meal on the porch.
If you never have a cold, you are very lucky. - We cannot use here 'when'!
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