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Concept
English conditional sentences
Summary
Prototypical conditional sentences in English are those of the form "If X, then Y". The clause X is referred to as the antecedent (or protasis), while the clause Y is called the consequent (or apodosis). A conditional is understood as expressing its consequent under the temporary hypothetical assumption of its antecedent.
Conditional sentences can take numerous forms. The consequent can precede the "if"-clause and the word "if" itself may be omitted or replaced with a different complementizer. The consequent can be a declarative, an interrogative, or an imperative. Special tense morphology can be used to form a counterfactual conditional. Some linguists have argued that other superficially distinct grammatical structures such as wish reports have the same underlying structure as conditionals.
Conditionals are one of the most widely studied phenomena in formal semantics, and have also been discussed widely in philosophy of language, computer science, decision theory, among other fields.
In English conditional sentences, the antecedent (protasis) is a dependent clause, most commonly introduced by the complementizer if. Other complementizers may also be used, such as whenever, unless, provided (that), and as long as. Certain condition clauses can also be formulated using inversion without any conjunction; see below.
The consequent clause, expressing the consequence of the stated condition, is generally a main clause. It can be a declarative, interrogative, or imperative clause. It may appear before or after the condition clause:
If I see him, I will tell him. (declarative sentence, condition first)
I will tell him if I see him. (declarative sentence, condition second)
If you saw him, would you tell him? (interrogative sentence, condition first)
Would you tell him if you saw him? (interrogative sentence, condition second)
If you see it, photograph it. (imperative sentence, condition first)
Photograph it if you see it.
Official source
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