if

出处：按学科分类—语言、文字 辽宁人民出版社《英汉辞典》第623页（1444字）

【词性】：conj．

【释义】：

①如果(用在真实条件句中)：If the wounded worker needs blood，take ours．如果受伤工人需要血，我们有．I shall see him if he comes．如果他来，我就见他．if necessary如果必要：Complete the following sentences，making proper changes，if necessary．完成下列句子，如果必要，可作适当的变动．if possible可能的话：We’ll set out tomorrow，if possible．可能的话，我们明天就出发．②假若，如果(用在虚拟语气的条件句中)：If capitalism were restored，millions of people would lose their lives．一旦资本主义复辟，千百万人头就要落地．If you had arrived five minutes earlier，you would have caught the train要是你早到五分钟，就可以赶上火车．if it were not for要不是…的话：If it were not for Chairman Mao，we could not have today’s happiness．要不是毛主席，我们就不能有今天的幸福．③即使，虽然：I will hold the position if I die for it．我死也要守住阵地．If he is old，he is full of vigour．他年龄虽大，倒是朝气蓬勃．even if 即使： I shall come，even if it rains tomorrow．即使明天下雨我也来．if any即使有：There are few，if any，mistakes in this article．这篇文章几乎没有什么错误．if ever即使有过，即使发生过：He rarely，if ever，comes late．他几乎从来不迟到．④…的时候，一旦：If I feel any doubt，I ask．一有疑问，我就问．⑤是否(用在ask，see，doubt，wonder等词后)：He asked me if I had ever seen the film．他问我看过这电影没有．Go and see if the door is locked．去看看门锁了没有．

△if a(day，yard，an inch，etc．)不管怎么说，一定…：He is seventy，if a day(=He is seventy，if he is a day old)．不管怎么说他一定有七十岁了．He measures six feet，if an inch．他确有六呎高．if only 1)要是…(用于虚拟语气的感叹句，表示愿望)：If only the combat hero were alive!那位战斗英雄要是活着多好啊!2)只要(用于真实条件句)：You will be welcomed by the workers，if only you become one with them．只要你同工人打成一片，他们就会欢迎你．