黑子学英语，干货分享，从什么时候开始都不晚！
今天继续分享#高考英语#托福雅思精选100句中第二十四句的分析，昨天分享了比较状语从句的用法，今天的重点是结果状语从句的用法。
Most substances contract when they freeze so that the density of a substance’s solid is higher than the density of its liquid.大多数物质遇冷收缩，所以他们的密度在固态时高于液态。
句型结构：本例句是一个含有时间状语从句、结果状语从句和比较状语从句的主从复合句。主句为“主-谓”结构，主语为substances，谓语是 contract，when they freeze是when引导时间状语从句，so that the density of a substance’s solid is higher than the density of its liquid是so that引导结果状语从句，其中than the density of its liquid是that引导比较状语从句。
知识点：结果状语从句
结果状语从句就是在句子中作结果状语的句子，一般放在主句之后。一般引导结果状语从句的连词有：so that, so… that…, such… that…, so…as to…, too…to…, enough to等
第一，so that引导结果状语从句：so that意为“因此，所以，以致于”，是表结果的词组。本例句里的结果状语从句就是由so that引导的。
【例】Tom worried so that he could not sleep. Tom太担心，所以都睡不着。
第二，so… that…表“如此…以致于…”，so是副词，修饰形容词或副词，所以它有以下几种结构
1.“so + 形容词 + that …”结构
【例】It was so hot that they had to stop the match. 天气是如此的热，结果是他们不得不取消了比赛。hot是形容词。
2．“so + 副词 + that”结构
【例】Tom drove so carelessly that he almost hit the tree. Tom开车是如此的粗心大意，结果是他差点撞到大树。carelessly是副词。
3． “so + 形容词+（冠词a/an）+ 名词 + that”结构：当名词为可数名词单数时，名词前加冠词；当名词为可数名词复数时，名词时不加冠词。
【例】Ada is so lovely a girl that all like her very much. Ada是如此可爱的一个女孩，结果是所有人都非常的喜欢她。girl是可数名词单数，名词girl前加冠词a。
4. “so many/much/few/little + 名词 + that”结构
【例】There was so much homework to do that Tom got tired. 有太多的作业要做，结果是Tom太累。
第三，such… that…意思也是“如此…以致于…”，such是形容词，修饰名词，所以它的结构一般是：“such (+冠词a/an)（+形容词）+ 名词 + that”
1．“such + (冠词a/an) + 形容词 +名词 + that”结构
【例】Tom is such a handsome man that all girls love him. man为可数名词单数，形容词handsome前加冠词a
【例】They are such smart children that his teachers all like them. Children为可数名词复数，形容词smart前不加冠词。
2. “such + 形容词 + 不可数名词 + that”结构
【例】It was such bad weather that they had to stay in the airport all day.天气是如此的糟糕，结果是他们不得一整天都留在机场。
注意，有时候，“such + 冠词a/an + 形容词 +名词 + that”结构与“so + 形容词 + 冠词a/an + 名词 + that”结构可互换。
【例】It was such a bad day that Tom do not want to go out. = It was so bad a day that Tom do not want to go out. 天气是如此的糟糕，结果是Tom不想出门。
当so或such在句首时，主句要用倒装。
【例】So merciful was Tom a man that he would have held an umbrella over a chick in a shower of rain. Tom是一个非常善良仁慈的人，结果是它会为只小鸡打伞遮雨。
第四，too…to…，意为“太…而不能…”
【例】Tom is too young to go to school. Tom因为太小，结果就是不能去上学。
第五，enough… to，意为“达到做某事的程度”
【例】Tom have enough time to finish his project. Tom有足够的时间，结果是可以完成他的项目。
第六，so + 形容词/副词+ as to…，意为“那么…以至于…”：当从句的主语与主句的主语相同时，可用这个结构来引导结果状语从句
【例】Tom was so kind as to phone for a taxi for me. 从句与主句的主语都是Tom。
