世界上60%以上的信件是用英语书写的，上两个世纪英国和美国在文化、经济、军事、政治和科学上的领先地位使得英语成为一种准国际语言。精品小编准备了高二英语必修三第五单元重要知识点，具体请看以下内容。
常用结构
rather than... 是……而不是……;与其……不如……;不愿
He ran rather than walked.他是跑的而不是走的。
Rather than allow the vegetables to go bad, he sold them at half price. 与其让蔬菜烂掉，他不如半价把它们卖掉。
联想拓展
do A rather than do B = rather than do B, sb. does A 某人不做B却做A
A rather than B是A而不是B
would rather do A than do B = would do A rather than do B 宁可做A而不做B
prefer to do A rather than do B 最喜欢做A而不做B
would rather sb. did/had done sth. 宁愿某人做某事
rather than表示客观事实，它连接的并列成分可以是名词、代词、形容词、介词(短语)、动名词、分句、不定式、动词等。后接不定式时，不定式可以带to，也可以不带to。但rather than位于句首时，则只能接不带to 的不定式。
(1)用括号内所给词语的适当形式填空
①Rather than@(ride) on a crowded bus, he always prefers (ride) a bicycle.
②I’d rather you (not come) yesterday.
③I think Tom, rather than you, (blame).
(2)翻译句子
①他一路跑过来而不是走过来。
②她喜欢把一些东西保存在房间里而不是把它们扔掉，尽管大部分都是无用的。
答案：(1) ①ride; to ride ②hadn’t come ③is to blame
(2) ①He came running all the way rather than walking.
②She likes to keep things in the house rather than throw them away, though many are useless.
2. It is so wet there that the trees are extremely tall, some measuring over 90 metres. 那儿的湿度很大，所以树都长得特别高，一些高达90多米。
some measuring over 90 metres 是独立主格结构。
联想拓展
独立主格结构由名词或代词加上其他成分构成，在语法上是一个独立的短语，不是句子，作用相当于状语从句，可表示时间、原因、条件、行为、方式或伴随情况。
构成形式：名词(代词) + 现在分词/过去分词/形容词/副词/不定式/介词短语。
①作时间状语:
The meeting over, they left the hall. 会议结束了，他们离开了大厅。
②作原因状语:
My watch having been lost, I didn’t know what time it was.我的表丢了，我不知道几点钟了。
③作条件状语:
Time permitting, I shall go to the cinema with you. 如果时间允许的话，我会和你一起去看电影。
④描述伴随行为或补充说明:
Mary entered the room, her hands in her pockets. 玛丽走进房间，手放在口袋里。
(1)用括号内所给动词的适当形式填空
①The test (finish), we began our holiday.
②Weather (permit), we are going to visit you tomorrow.
(2)完成句子
①He came into the room, his ears (冻得发红).
②He came out of the library, a book (夹在胳膊下).
答案：(1)①finished ②permitting
(2)①red with cold ②under his arm
高中是人生中的关键阶段，大家一定要好好把握高中，编辑老师为大家整理的高二英语必修三第五单元重要知识点，希望大家喜欢。
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