| 单词 | 状语从句 |
| 释义 | 〔if〕In such contexts, however,the use ofif can sometimes create ambiguities. Depending on the intended meaning, the sentenceLet her know if she is invited might be better paraphrased asLet her know whether she is invited or If she is invited, let her know. · In conditional sentences the clause introduced byif may contain either a past subjunctive verb (if I were going ) or an indicative verb ( if I am going; if I was going ), depending on the intended meaning.According to the traditional rule,the subjunctive should be used to describe an occurrence that is presupposed to be contrary to fact,as inif I were ten years younger or if Napoleon had won at Waterloo. The main verb of such a sentence must then contain the modal verbwould or (less frequently) should: 不过在这种情况下，用if 就可能会造成歧义。 Let her know if she is invited 这句话最好根据所要表达的意思， 分开说成告诉她她是否被邀请了 或 如果她被邀请了，就让她知道 两句话。 用if 引起的条件状语从句中， 可以含有一个过去式的虚拟动词(倘若我去 )或一个一般陈述动词( 如果我就去；如果我去了 )， 这得依据所要表达的意思而定。根据正统的原则，虚拟语气用来表达一个与事实相反的假设，例如如果我再年轻十岁 或者 如果拿破仑在滑铁卢战役中获胜。 于是在这样的句子里，主要动词必须包含情态动词会 或（在较少情况下） 应该： |
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