難點釋疑：

　　(一)主從句時間不一致情況下的虛擬語氣(混合條件句)

　　有時條件從句中的動作和結(jié)果與主句中的動作，發(fā)生的時間不一致，這時動作的形式應(yīng)根據(jù)它所表示的時間加以調(diào)整。如：

　　If you had followed my advice, you would be able to finish the work now. 如果你當(dāng)時聽了我的話，現(xiàn)在就能完成這份工作了。(從句說明過去，主句說明現(xiàn)在。)

　　If I were you, I would have gone to her birthday party. 如果我是你，我就去參加她的生日晚會了。(從句說明現(xiàn)在，主句說明過去。)

　　If you hadn't lent me some money, I couldn't have bought the new house and most likely I would be still living in the dangerous house now. 假若你不借錢給我， 我不可能買下這幢新房，很可能現(xiàn)在還住在危房里。(從句說明過去，主句說明過去和現(xiàn)在。)

　　(二)含蓄條件句

　　非真實條件句中的條件從句有時不表出來，只暗含在上下文中，這種句子叫做含蓄條件句。含蓄條件句大體有三種情況;

　　1. 條件暗含在短語中。如：

　　(1)W hat would I have done without you?

　　如沒有你，我會怎么辦呢?(條件暗含在分詞短語without you中)

　　(2) It would be easier to do it this way.

　　這樣做會比較容易。(條件暗含在不定式短語to do it this way中)

　　(3) This same thing, happening in wartime, would lead to a disaster.

　　同樣的事，如發(fā)生在戰(zhàn)時，就會釀成大禍。(條件暗含在分詞短語happening in wartime中)

　　(4) But for your help we couldn't have succeeded in the experiment.

　　如果沒有你的幫助，我們的實驗是不會成功。(暗含條件是but for your help)

　　(5) He must have the strength of a hippopotamus, or he never could have vanquished that great beast. 他一定是力大如河馬，否則他絕不會擊敗那只龐大的野獸。(暗含條件是連詞or)

　　(6) Alone, he would have been terrified. 如是單獨一人，他是會感到害怕的。(暗含條件是alone)

　　(三)條件從句中省去if的情況

　　在if引導(dǎo)的表示虛擬的條件狀語從句中，常可以省略if，將had, were或should提至句首。

　　Had I seen the film, I would have discussed it with them last night. 假如我看了那部電影，昨晚我就可以和他們一起討論了。

　　Were I a bird, I could fly freely. 假如我是一只小鳥，我就能自由翱翔。

　　Should it rain next week the farmers would have a good harvest. 要是下周能下雨的話，農(nóng)民們就能有個好收成了。