专题05 句型知识梳理二：Unit 4-Unit 7-2022-2023学年八年级英语上学期期末考点大串讲（牛津上海版）

专题05 句型知识梳理二：Unit4-Unit7 Unit4: Key sentence structure 1．...because it made it easier to write big numbers and to calculate．……因为它(0)使得大数字的书写和计算更加容易。 (1) because conj．因为 e.g. I was angry because he was late. 因为他迟到了，所以我生气。 【指点迷津】because, since, as, for 都是表示“原因”的连词。以上连词的语气由强至弱依次为because since as for; 其中because，since，as为从属连词，引导原因状语从句; for为并列连词，连接两个并列句。 ①Because“因为"，表示直接原因，回答why的提问，一般放在主句之后，可单独存在。 e.g. -Why don't you buy it? 为什么你不买它？ -Because I don't have enough money with me．因为我没有带足够的钱。 We stayed at home because it rained．下雨了，所以我们待在家里。 ②since “因为，既然”，侧重主句，从句表示显然的或已知的理由。 e.g. Since everyone is here，let's begin. 既然大家都到齐了，我们开始吧。 ③as“由于，鉴于”，主从句并重，从句说明原因，主句说明结果，为常用词。 e.g. As it was late，I must hurry up．由于晚了，我得快点。 ④for“因为，由于”，表明附加或推断的理由，其前常有逗号，for及其后的句子不放在句首。 e.g. He must be ill，for he isn't here today．他一定是病了，因为今天他没来。 【友情提示】“因为……所以”的英汉不同习惯: because和so 与although和but用法相同，都不可连在一起使用，只能用其中一个，这一点和汉语不同，使用时一定要注意两种语言的不同习惯。 因为他病了，所以他没来上学。 [误]Because he was ill, so he didn't come to school. [正]Because he was ill, he didn't come to school. [正]He was ill, so he didn't come to school. (2) make it+adj. + to do sth．使得做某事变得…… e.g. The electronic dictionary makes it quicker to look up a new word. 电子词典使我们查阅生词更迅速。 2．Abacuses are so fast and accurate that people still use them today．算盘（计算起来）是如此的快速和精确，因此人们至今还在使用它们。 so…that…“如此……以至于”，引导结果状语从句，so后接形容词或副词，that后面接从句。 e.g. The box is so heavy that I can't carry it．这个箱子如此的重以至于我抬不动它。 He runs so fast that his classmates can't catch up with him. 他跑得如此快以至于他的同学都赶不上他。 【友情提示】当that后面的从句为否定句时，可以用too…to改写为简单句，当that后面的从句为肯定甸时，可以用enough to改写为简单句。 e.g. He is so young that he can't go to school. =He is too young to go to school．他太小了，还不能去上学。 He is so tall that he can reach the apples on the tree. =He is tall enough to reach the apples on the tree．他很高能够得到树上的苹果。 so后面有单数名词时可用such ...that…进行改写。 e.g. He is so tall a man tha