The conditional is a mood expressing that something happens or would happen only if something else happens. Sentences in this grammatical mood are made up of an “if-clause” and another clause. There are mainly four types of conditionals: the zero, the first, the second and the third conditional.
1. Conditionals sentences
a. If my parents (not permit) me I will not go to the party.
Correct: If my parents do not permit me, I will not go to the party.
This sentence is in the first conditional because it expresses a likely situation. Constructions in this mood have an “if clause” in present simple and another clause in simple future.
b. If Susan loved David she (to marry) him.
Correct: If Susan loved David she would marry him.
This sentence is in the second conditional: it describes an unreal or imaginary situation. Constructions in this mood have an “if clause” in past simple and a clause having would + infinitive.
c. If I had seen this film last week I (not to go) to the cinema.
Correct: If I had seen this film last week I would not have gone to the cinema.
This sentence describes an unreal or imaginary situation in the past, so it is an example of the third conditional, which is formed with an “if clause” in past perfect and a clause having would + have + past participle.
2. Define the type of conditional offer
1)a. If I were a bird I would fly.
It is in the second conditional because it describes an unreal or imaginary situation and is formed by an “if clause” in past simple and a clause having would + infinitive.
2)b. If he hadn`t been ill last week he would have gone to the party.
Third conditional: This sentence describes an unreal or imaginary situation in the past and is formed with an “if clause” in past perfect and a clause having would + have + past participle.
3)c. He will help you if he has time.
This sentence is in the first conditional because it expresses a likely situation, and is formed by an “if clause” in present simple and a clause in simple future.
4)d. If I were the Minister of Education I would let pupils study the Governmental system of Kazakhstan.
It is in the second conditional. It expresses an unreal or imaginary situation.
5)e. If he had missed yesterday, he would have been late for work.
It is in the third conditional: It is formed with an “if clause” in past perfect and a clause having would + have + past participle.
6)f. If I see her, I will tell her this story.
This sentence describes a likely or real situation, and is formed by an “if clause” in present simple and a clause in simple future, so it is in the first conditional.