高考英語單元知識點復習Unit 15-Unit 17
如果你感到有迫切的愿望去打點行李，探索世界之精彩，你可能考慮下列目的地中的一個。 以上句子中should開頭的句子是省略if的虛擬條件從句。例:should it rain tomorrow,the meeting would be put off. =if it should rain tomorrow,the meeting would be put off. 如果明天下雨，會議就延期。 patience is bitter,but its fruit is sweet.忍耐是痛苦的，但它的果實是甜蜜的。鏈接·提示 虛擬條件句中if的省略: (1)當虛擬條件句中含有were,had,should等詞時，可以將if省略，同時把were,had,should等詞置于句首。此句型一般用于書面語。 were it not for the sun(=if it were not for the sun),nothing could exist on the earth. 如果沒有太陽，世界上將什么也不存在。 had they not helped us(=if they had not helped us),we wouldn’t have succeeded. 如果沒有他的幫助，我們就不會成功。 should it rain tomorrow(=if it should tomorrow),what would you do? 如果明天下雨，你們怎么辦？ (2)虛擬條件從句沒有were,had 或should等助動詞時，不能通過添加did的方式構成倒裝。 正確:if he smoked less,he wouldn’t cough so much. 如果他少抽點煙，就不會咳嗽得這樣厲害。 錯誤:did he smoke less,he wouldn’t cough so much.練:(1) the chance arise,i’d love to go to beijing.a.would b.should c.shall d.can提示:本題考查虛擬條件句中省略if的用法。句意為:假如有機會，我就去北京。答案:b(2) for the timely investment from the general public,our company would not be so thriving(興旺的)as it is.a.had it not been b.were it notc.be it not d.should it not be提示:從句意來看，條件句表示的是與過去相反的假設，主句表示與現(xiàn)在相反的事實。這種虛擬句叫做“錯綜時間條件句”。故選a項。條件句補上if，就成為if it had not been for the timely investment from general public。答案:a辨析1.be known as,be known for,be known by,be known to(1)be known as意為:作為……知名；被稱作是；大家公認為；叫作。as后接表示“身份”的名詞。