conj. （表条件）如果；即使；是否；（表假设）假如
n. 条件；设想
英 [ɪf] 美 [ɪf]
权威例句
- If you wait, all that happens is that you get older.
如果你等待，发生的只有变老。
来自金山词霸 每日一句 - If you love life, life will love you back.
热爱生活，生活也会厚爱你。
来自金山词霸 每日一句 - If you're not satisfied with the life you're living, don't just complain. Do something about it.
对于现况的不满，不能只是抱怨，要有勇气作出改变。
来自金山词霸 每日一句 - If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre
如果你独处时感到寂寞，说明没有把自己陪好。
来自金山词霸 每日一句 - Friendship means understanding, not agreement. It means forgiveness, not forgetting.It means the memories last, even if contact is lost.
友情是理解，不是妥协；是原谅，不是遗忘。即使不联系，感情依然在。
来自金山词霸 每日一句
中文词源
if 如果
来自PIE*i,那个，那里，它，词源同id,idem,yonder.用作连词指如果。
英文词源
if
**if: **[OE] The Old English version of _if _was gif, but its initial _g _was closer to modern English _y _in pronunciation than to g, and the conjunction gradually evolved through Middle English _yif _to if. It is not known where it ultimately came from; it is evidently connected with Old High German _iba _‘condition’ and Old Norse _ef _‘doubt’, but whether it started life as a noun like these or was from the beginning a conjunction is not clear. Its surviving Germanic relatives are German _ob _‘whether’ and Dutch _of _‘if’.
if (conj.)
Old English gif (initial g- in Old English pronounced with a sound close to Modern English -y-), from Proto-Germanic *ja-ba (cognates: Old Saxon, Old Norse ef, Old Frisian gef, Old High German ibu, German ob, Dutch of "if, whether"), from PIE pronominal stem *i- [Watkins]; Klein, OED suggest probably originally from an oblique case of a noun meaning "doubt" (compare Old High German iba "condition, stipulation, doubt," Old Norse if "doubt, hesitation," Swedish jäf "exception, challenge"). As a noun from 1510s.
