I should have written the letter earlier. But I have been very busy.

　　要能登上珠穆朗瑪峰，那經歷該多棒!

　　It would be a fantastic experience to climb up to Mount Everest.

　　6、虛擬語氣省略條件從句或主句

　　表示虛擬語氣的條件句的主句或從句有時可以省略，而省略部分的含義仍有所體現。

　　1)省略條件從句，如：

　　It would be very nice.

　　You could have done it yourself. (省略If you had wanted to.上下文可以看出You didn’t want to.) (Fact: You didn’t do the work yourself because you didn’t want to.)

　　I wouldn’t smoke. (省略If I were you.) (表面上說我，實際上說你。這是一種委婉的表達法。(Fact: You smoke very often. I advise you not to smoke any more.)

　　2)省略主句：在強調條件從句時，常省略主句，這種句子常表示一種“已不能實現”的愿望，主要用于If only 引導的感嘆句中。

　　For example:

　　If only he were here!

　　If only I knew more!

　　If only he had stayed with us!

　　Now let’s do some translation:

　　要是我聽了他的建議就好了!

　　If only I had taken his advice!

　　我如果是一只鳥就好了!

　　If only I were a bird.

　　快用If only 造三個句子，表達你的愿望!

　　If only I could live in a big apartment!

　　If only I were a billionaire!

　　If only I could marry her/him!

　　(二)虛擬語氣的其他句型和用法

　　1、用在“wish+賓語從句”中，表示很難實現或不能實現的愿望，可以翻譯為“但愿…”, “悔不該…”等。表示現在不能實現的愿望，從句的謂語動詞用過去式;表示將來的愿望，從句的謂語動詞用“would (could)+動詞原形”;對過去的事情表示愿望，從句的謂語動詞用 “had+過去分詞” 或“could + have + 過去分詞”。Wish 后面的賓語從句必須用虛擬語氣，不管這個愿望是否能實現。如：

　　I wish it were Spring all the year round.

　　I wish you could go with us.

　　We wish we had arrived there two hours earlier.

　　Now let’s do some translation using “wish”:

　　我要是Jane 就好了。

　　I wish I were Jane.

　　他真希望自己生活在中世紀。

　　He really wishes that he were living in the Middle Ages.

　　但愿北京整年是秋天。