only if和if only的优质解答

only if表示"隻有"；if only則表示"如果……就好了".If only也可用于陳述語氣.I wake up only if the alarm clock rings. 隻有鬧鍾響了,我才會醒.If only the alarm clock had rung. 當時鬧鍾響了,就好了.If only he comes early. 但願他早點回來.辨析only if 與 if only only與if這兩個單詞随意組合,可以組成兩個意義相近,但用法不盡相同的短語only if與if only.現将它們的具體用法辨析如下：一、only if意爲“only on the condition that, as long as”,“隻要；假如”.它用于陳述事實或必要的條件,比if所表達的語氣更強烈.You'll pass this course only if you study. 隻要你學,你就會通過這門課.Children may enter the club only if they are accompanied by adults. 隻要孩子們有大人陪同就可以參加俱樂部.The students at the university can take up part-time job only if it doesn't interfere with their studies. 隻要不影響學業,這所大學的學生可以從事兼職工作.二、if only則有兩種含義.第一種含義與only if近似,意爲“as long as”,“隻要”.例如：If only it clears up, we'll go. 隻要天一放晴,我們就去.第二種則是“expressing a wish or assumption”, “但願；如果……就好了”.它用來表達一個不可能實現的願望或假設,句子要用虛拟語氣.例如：If only she would come!要是她能來就好了!If only you had told me you had a spare ticket for the show. 如果你告訴我,你多了一張演出票就好了.If only you had worked with greater care!你要是工作更仔細一些該多好!