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Concept
Irrealis mood
Résumé
In linguistics, irrealis moods (abbreviated ) are the main set of grammatical moods that indicate that a certain situation or action is not known to have happened at the moment the speaker is talking. This contrasts with the realis moods.
Every language has grammatical ways of expressing unreality. Linguists tend to reserve the term "irrealis" for particular morphological markers or clause types. Many languages with irrealis mood make further subdivisions between kinds of irrealis moods. This is especially so among Algonquian languages such as Blackfoot.
Subjunctive mood
The subjunctive mood, sometimes called conjunctive mood, has several uses in dependent clauses. Examples include discussing hypothetical or unlikely events, expressing opinions or emotions, or making polite requests (the exact scope is language-specific). A subjunctive mood exists in English, but it often is not obligatory. Example: "I suggested that Paul eat an apple", Paul is not in fact eating an apple. Contrast this with the sentence "Paul eats an apple", where the verb "to eat" is in the present tense, indicative mood. Another way, especially in British English, of expressing this might be "I suggested that Paul should eat an apple", derived from "Paul should eat an apple."
Other uses of the subjunctive in English, as in "And if he be not able to bring a lamb, then he shall bring for his trespass..." (KJV Leviticus 5:7), have become archaic or formal. Statements such as "I shall ensure that he leave immediately" often are formal, and often have been supplanted by constructions with the indicative, such as "I'll make sure [that] he leaves immediately". (In other situations, the verb form for subjunctive and indicative may be identical: "I'll make sure [that] you leave immediately.)
The subjunctive mood figures prominently in the grammar of the Romance languages, which require this mood for certain types of dependent clauses. This point commonly causes difficulty for English speakers learning these languages.
Source officielle
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