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Conditionals are sentences with two clauses: an ‘if' clause and a main clause.
Four basic conditional structures are used in English:

• Zero Conditional
• First Conditional
• Second Conditional
• Third Conditional

Zero conditional	What is always true or usually happens, or what is advised in this situation.
If	+Present Simple	+Present Simple
If	you have a ticket	you go straight in.
If	you stand in the rain	you get wet.
If	you see an accident	call an ambulance.

Note : The 'if'  in the above sentences can usually be replaced by 'when' without changing the meaning.

First conditional	Something that will possibly happen in the future.
If	+Present Simple	+Will + Infinitive
If	I see an accident	I will call a doctor.
If	it rains tomorrow	the picnic will be cancelled.
If	you make an apple tart	Dad will eat it.

Note : Sometimes we use can or may instead of 'will'.
For example :  "If you finish your vegetables, you can have a dessert."

Second conditional	Imaginary events that are probably not going to happen.
If	+Past Simple	+Would + Infinitive
If	I saw an accident	I would call a doctor.
If	he had more money	he would buy a new car.
If	she worked harder	her results would improve.

Note : Sometimes we use could or might instead of 'would'. For example:
"If we invited the author, he might come."
"If we ordered a larger quantity, we could ask for a reduction."

Third conditional	Something that did not happen, and the reaction or result you imagine if it really had happened.
If	+Past Perfect	+Would + have + Past Participle
If	I had seen the accident	I would have called a doctor.
If	he had read the instructions	he would have assembled it faster.
If	she had stayed in Paris	she would have improved her French.