if /if/ conj. 1. (表示条件)如果：If you will wait a minute, I shall go and find him. 如果你愿意等一会儿的话，我就去把他找来。2. (表示假设，用虚拟语气)假如：［考句］Jean doesn’t want to work right away because she thinks that if she were to get a job she probably wouldn’t be able to see her friends very often.珍妮不想马上参加工作，因为她觉得要是工作了，可能就不能经常见到朋友了。（if条件句用与将来事实相反的形式：were + 不定式）［考句］Rebecca would have told me earlier if she did not like her house she bought last month.如果吕贝卡不喜欢她上个月买的房子的话，她早就会告诉我的。（与过去事实相反的虚拟语气形式）3. (表示和事实相反的愿望，用虚拟语气)要是…多好：If I had been warned!要是有人及早提醒我多好! 4. 是否：I wonder if/whether he is at home. 我不知道他是否在家。even if 尽管，即使：We shall go, even if it rains. 就是下雨，我们也要去。as if/though 好像；仿佛：He talks as if he were tired. 他说话的时候好像很累。if only只要；要是…就好（表示说话人的一种愿望，谓语动词要用虚拟形式）：If only I knew it! 要是我知道就好了。If only he could come! 要是他能来该多好啊!［考句］Look at the terrible situation I am in! If only I had followed your advice.看我现在的处境多糟糕！要是我听从你的劝告多好。（If only后的动词虚拟形式，与过去事实相反）［考句］ I’m sure he is up to the job if only he would give his mind to it .只要他专心去做，我相信他能胜任这项工作。（表示将来的愿望用would + 动词原形）