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Definición de “if” en inglés

if

conjunction (REQUEST)    /ɪf/
used when you want to make a polite request or remark : If you'd like to take a seat , Mr Chang will be with you in a moment . Would you mind if I open / opened (= can I open ) the window ? There are, if you don't mind me saying so, one or two problems with this plan .Connecting words which express a condition Gramática:IfIf is a conjunction.Gramática:If or when?We use if to introduce a possible or unreal situation or condition. We use when to refer to the time of a future situation or condition that we are certain of:Gramática:If: conditionsWe often use if to introduce possible or impossible situations or conditions and their results. The situations or conditions can be real, imagined or uncertain:Gramática:If possible, if necessaryWe can sometimes leave words out after if to form fixed expressions:Gramática:If so, if notWe use so or not after if when it is obvious what we are referring to:Gramática:Even ifWe can use even if to mean if when talking about surprising or extreme situations:Gramática:If: reporting questionsWe use if to introduce reported yes-no questions and questions with or.Gramática:If and politenessIn speaking, we often use if to introduce a polite request. If is usually followed by modal verbs will, would, can or could when it is used to be polite:Gramática:When or if?We use when to refer to a future situation or condition that we are certain of, whereas we use if to introduce a possible or unreal situation.
(Definition of if conjunction (REQUEST) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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