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In English language teaching, conditional sentences are often classified under the headings zero conditional, first conditional (or conditional I), second conditional (or conditional II), third conditional (or conditional III) and mixed conditional, according to the grammatical pattern followed, particularly in terms of the verb tenses and ...
A conditional sentence expressing an implication (also called a factual conditional sentence) essentially states that if one fact holds, then so does another. (If the sentence is not a declarative sentence, then the consequence may be expressed as an order or a question rather than a statement.)
Conditional clauses in Latin are clauses which start with the conjunction sī 'if' or the equivalent. [1] The 'if'-clause in a conditional sentence is known as the protasis , and the consequence is called the apodosis .
The "if"-clause of a conditional sentence is called the protasis, and the consequent or main clause is called the apodosis. The negative particle in a conditional clause is usually μή (mḗ), making the conjunctions εἰ μή (ei mḗ) or ἐὰν μή (eàn mḗ) "unless", "if not". However, some conditions have οὐ (ou). [1]
Examples are the English and French conditionals (an analytic construction in English, [c] but inflected verb forms in French), which are morphologically futures-in-the-past, [1] and of which each has thus been referred to as a "so-called conditional" [1] [2] (French: soi-disant conditionnel [3] [4] [5]) in modern and contemporary linguistics ...
The corresponding logical symbols are "", "", [6] and , [10] and sometimes "iff".These are usually treated as equivalent. However, some texts of mathematical logic (particularly those on first-order logic, rather than propositional logic) make a distinction between these, in which the first, ↔, is used as a symbol in logic formulas, while ⇔ is used in reasoning about those logic formulas ...
Moreover, languages that do use the subjunctive for such conditionals only do so if they have a specific past subjunctive form. Thus, subjunctive marking is neither necessary nor sufficient for membership in this class of conditionals. [12] [13] [9] The terms counterfactual and subjunctive have sometimes been repurposed for more specific uses ...
The conditional perfect is a grammatical construction that combines the conditional mood with perfect aspect.A typical example is the English would have written. [1] The conditional perfect is used to refer to a hypothetical, usually counterfactual, event or circumstance placed in the past, contingent on some other circumstance (again normally counterfactual, and also usually placed in the past).