The Zero Conditional: (if + present simple, ... present simple) ...
The First Conditional: (if + present simple, ... will + infinitive) ...
The Second Conditional: (if + past simple, ... would + infinitive) ...
The Third Conditional. (if + past perfect, ... would + have + past participle)
The type 3 conditional refers to an impossible condition in the past and its probable result in the past. These sentences are truly hypothetical and unreal, because it is now too late for the condition or its result to exist. ... In type 3 conditional sentences, the time is the past and the situation is hypothetical.
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Answer:
The Zero Conditional: (if + present simple, ... present simple) ...
The First Conditional: (if + present simple, ... will + infinitive) ...
The Second Conditional: (if + past simple, ... would + infinitive) ...
The Third Conditional. (if + past perfect, ... would + have + past participle)
The type 3 conditional refers to an impossible condition in the past and its probable result in the past. These sentences are truly hypothetical and unreal, because it is now too late for the condition or its result to exist. ... In type 3 conditional sentences, the time is the past and the situation is hypothetical.