人教课标高一必修4 Unit 2 Working the land单元复习课件.ppt

1. If so, what did you do to grow them? 如果这样的话, 你做了些什么来种植这些植物？ ①if so意为“如果是这样的话”, 是if引导的条件状语从句的省略形式, 表示肯定意义, 如果表示否定意义, 则用 if not。 (三) 句式 ②if 构成的其他省略形式： if any 如果有的话 if possible 如果可能的话 if necessary 如果必要的话 [真题呈现](2011·江苏，33) It sounds like something is wrong with the car’s engine. ________, we’d better take it to the garage immediately. A. Otherwise B. If not C. But for that D. If so D 2. In 1974, he became the first agricultural pioneer in the world to grow rice that has a high output. the first/last/best/only/very/right ...+n. + to do sth. 表示“第一个/最后一个/最好的一个/唯一的/恰好的/合适的……做某事的人/物”。 不定式放在表示次序的词the first, the last, the best以及the only, the very, the right等词后面,且这些词与动词不定式有逻辑上的主谓关系。 e.g. He is always the first to come and the last to leave. 他总是第一个来最后一个离开。 The last man to leave the sinking ship was the captain. 最后一个离开正在下沉的船的那个人是船长。 3. Using his hybrid rice, farmers are producing harvests twice as large as before. 用他的杂交水稻种子，农民们种出的粮食比以前多了一倍。 倍数表达法： A＋be＋倍数＋as＋adj.＋as＋B A＋be＋倍数＋比较级＋than＋B A＋be＋倍数＋（由某些形容词变化而来的）n.＋of＋B e.g. I’m not going out with a man who’s twice as old as me. 我不愿意和一个年纪比我大一倍的男人一起参加社交活动。 My house is three times bigger than yours. 我的屋子比你的大三倍。 Your playground is 900 metres wide, three times the size of ours. 你们操场有900米宽, 是我们的三倍。 动词-ing形式作主语和宾语 一、动词-ing形式作主语 ★ 动词-ing形式作主语，表示一般或抽象的习惯性行为，谓语动词用单数。如： Reading aloud is very important for us to learn a foreign language. Going to bed early and getting up early is considered to be a good habit. ★ 在一些句子中，常用it作形式主语放在句首，而把真正的主语放到句末。 如： It is very important remembering others’ names. It is no use crying over spilt milk. 二、动词-ing形式作宾语 ★ 有些动词后只能跟动词-ing形式作宾语，而不能跟动词不定式作宾语。有此用法的动词有：allow, advise, admit, appreciate, avoid, bear, consider, delay, deny,?enjoy, escape, finish, forbid, imagine, keep, mind, mention, permit, practice, quit, risk, suggest等。 My mother advised asking a doctor to come and examine my eyes. We’re cons