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If you knew the circumstances you would (might) forgive me．如果你了解情况，你是（可能）会原谅我的。（可惜你不了解。）
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If I had another £500, I could buy a car．如果我再有500镑，我可以买辆车。
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从句中的谓语如果是be，多用were这个形式，不管是什么人称：
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If there were anything to tell, I would tell you．如果有什么事，我会告诉你的。（不过目前没什么事。）
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You wouldn’t be anywhere if it were not for Ruth．若不是有鲁思，你不会有任何成就。（幸亏有她。）
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If I were you, I‘d go to night school．我要是你，我会上夜校。
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但在日常口语中，在第一、第三人称单数后，用was的时候也不少：
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If John was (were) here, he would know．如果约翰在这里，他是会知道的。
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There would be endless rows if I was at home．如果我在家，会有吵不完的架。
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虚拟条件句中这类特殊的动词形式多数语法学家都称为虚拟语气（the subjunctive mood）。由于存在着一些争议，有些词典避免用这个名称。这类句子有时可用来使语气显得客气一些：
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It would be nice if you helped me a bit with the housework．如果你能帮我做点儿家务活就好了。
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Would it be all right if I came round about seven tomorrow？明天七点左右我来合适吗？
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Would it be all right if I brought a friend tonight？今晚要是我带一个朋友来可以吗？
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另外if还可引起宾语从句，表示“是否”：
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I asked them if they had any rooms to lent．我问他们是否有房子出租。
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I wonder if I can get some advice from you．我想知道你能否给我出点儿主意。
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I’ll go and see if he wants anything．我去看他是否需要什么。
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还可引起某些短语，如：
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as if 仿佛，就像（后面从句中的谓语多用虚拟语气）：
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He ordered me about as if I were his wife．他对我发号施令，就仿佛我是他妻子似的。
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He behaves as if he owned the place．他表现得就像他是这里的主人。
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even if 即使：
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We’ll go even if it rains．即使下雨我们也去。
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He’ll come even if he’s ill．他即使生病也会来。
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if need be 如果必要的话：
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