人教版高中英语新课必修三(专家总结.ppt

So whether life will continue on the earth for millions of years to come will depends on whether this problem can be solved. 生命能否在地球上延续几百万年将取决于这个问题能否被解决。 ▲whether life… come 为whether 引导的主语从句。而whether … solved 为whether 引导的介词on 的宾语从句。 whether 表疑问“是否， 起连接作用。可引导主语从句，同位语从句，表语从句，宾语从句。 What I want to make clear is whether you are interested in skating. 我想弄明白的是你是否对滑冰感兴趣。 【联想拓展】 ▲whether 与if whether和if 在引导宾语从句时，可互换。但在下列情况下只用whether, 而不用if: （1）在表语从句，主语从句，同位语从句中。 （2）后面接不等式时。 （3）后接or not 时（it 作形式主语外； 在介词后时。 It all depends on whether we will have enough money. 这完全取决于我们是否有足够的钱。 It hasn’t been decided whether/ if the sports meeting will be held on time. 运动会是否按时举行还没有定下来. 【高手过招】完成句子 _______________________ in the end will mainly depend on what you do and how you do it. 最后你是否能成功主要取决于你做事。 【答案】Whether you can succeed When we got closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earth’s. 当我们更接近月球时，就会感到月球的引力在拉我们。但是，月球的引力不想地球的引力那么大。 ▲as…as “和……一样”，第一个as为副词，相当于so, 第二个as为连词。有时可用于结构 “as + 形容词+ a/ an + 可数名词单数+ as” 倍数的表达形式里面。 This is as good a book as that one. 这本书和那本一样好。 【联想拓展】 ▲ as long as 长达 as/ so long as 只要 as soon as 一 …… 就 …… as/so far as 与 ……几乎一样 as …… as possible 尽可能 【高手过招】完成句子 （1）.Our neighbour has _____________________ ours. 我们邻居家的房子和我们家的一样大。 （2）.I would gladly have paid________________ for the dictionary. 就是价格再贵一倍，我也愿意把这本字典买下来的。 （3）.As a result, costs will be reduced_________________. 因此，成本将会降低90%之多。 【答案】 （1）as big a house as （2）. twice as much （3）by as much as 90% But when I tried to step forward, I found I was carried twice as far as on the earth and fell off. 而当我试着向前迈步的时候，我发觉我被送出去很远，步子的跨度竟是地球上的两倍，因而我摔倒了。 ▲ 倍数的表达方法有： （1）基数词+times + adj. /adv. 比较级+ than This room is three times bigger than that one. 这间房子比那间房大三倍。 （2）基数词+times + as + adj. /adv.的原级+ as This room is four times as big as that one. 这间房子比那间房大三倍。 （3）基数词+times+ the + 名词 +of This room is four times the size o