1、Book 3 Unit 4 难句解析1. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. (P25). be to do 在此句中表示不可避免将要做的事或命中注定的事。如：This experience was to change his life. This discovery was to have a major effect on the treatment of heart disease.
2、【拓展】 a. be to do 还可以表示命令、义务、职责等，译为“应该，必须”，多用于长辈对晚辈，上级对下级等。如：You are to eat all your supper before you watch TV.b. be to do 还可以表示按计划约定要做的事。常用于正式文件中。如：They were to get married in May.【练习】 完成句子：1) As a child, he never knew _ (他会成为) a famous singer.2) The Prime Minister _ (将访问) Budapest.3) You _ (不可以吸烟)
3、 in this room. 2. Others, called amphibians, were able to live on land as well as in the water. (P26)as well as意为“不但而且，既又，除之外，还有”，在肯定句中起连接作用，重在强调其前面的人或物，相当于not only. but also.，重在强调but also后面的人或物。如：She is a talented musician as well as being a photographer.She is not only a photographer but also a ta
4、lented musician.【拓展】 a. A as well as B 用作句子主语时，谓语动词需同A保持一致。如：Tom as well as most of his friends likes football.b. as well as 位于句首时，后面的动词则需用动名词形式。如：As well as breaking his leg, he hurt his arm.【练习】 完成句子：4） _ (不但完成) his own work, John helped his friends with their work. 5) His children _ (除了他的妻子外，连他的孩
5、子们都被邀请参加了) the party. 3. But when I tried to step forward, I found I was carried twice as far as on the earth and fell over. (P31)我们常用三种最基本的表达倍数的方式，他们是 “倍数（分数） + as. as. / 倍数（分数） + 比较级 / 倍数（分数） + the + 名词 + of ”。如：Their room is one-third as large as ours. 他的房间只有我们的三分之一大。This room is 3 times the size
6、 of that one.This room is 3 times as big as that one.This room is twice bigger than that one. 这个房间是那个房间的三倍大。【练习】 完成句子（用所讲的三种表达方法）6) This river is _ (是那条河的三倍长) that one. 参考答案1) he was to become2) is to visit3) are not to smoke4) As well as finishing5) as well as his wife were invited to6) 3 times as long as / twice longer than / 3 times the length of