Unit1 （GrammarA&B）语法讲解+练习2021-2022学年牛津译林版英语九年级上册

9AUnit1---GrammarA 并列连词and/but/or/so的用法。 一、and、or、 but、 so 的基本用法： ★and: ①表并列关系：“和、并且、又”；（and 在否定句中改为or）。We use"and” to join ideas that are similar. e.g.： Daniel is modest and never shows off. I am active and energetic，and I love working with people. ②用于祈使句，表结果，and 通常是比较好的结果。e.g.： Try your best，and you’ll make more progress. ★but: 表转折关系：“但是”；（不能和(al)though同时使用）。(al)though用于表示原因的句子前，but用于表示结果的句子前。We use"but" to join ideas that are different. Attention: We can never use but and (al)though together. e.g.： ◆ Although/Though I have passed the exam, I am not pleased with the result. =I have passed the exam, but I am not pleased with the result. ◆ He doesn't like to talk much, but his work shouts. = Although/Though he doesn't like to talk much, his work shouts. ★or: ①表选择关系：“或者”；We use "or" to introduce another possibility. e.g.： I can be a good teacher or a good doctor. Which do you like better, apples or pears? ②表并列关系：“和、并且、又”；在否定句中or表并列关系。 In negetive sentences (在否定句中)，we use "or" to join two or more ideas. e.g.： He does not like singing or dancing. ③用于祈使句，表结果，or通常表示不愉快或不理想的结果：“否则，要不然(=otherwise)”。“Or” has another meaning, it can also mean “otherwise(否则)”. e.g.： Get up quickly, or you’ll be late. Study hard, or you won’t pass the exam. Don’t lose heart, or you’ll lose all. ★so: 表因果关系：“因此、所以”；（不能和because同时用）。because用于表示原因的句子前，so用于表示结果的句子前。We use "so" to express the result of sth. Attention: We can never use so and because together. e.g.： I want to share the best art with people, so I am always searching for something better or different. It began to rain, so we went home.=Because it began to rain, we went home. 二、and、or、 but、 so 的特殊用法： 一、）同义句改写： ◆ Study hard, and you can get good grades. =If you study hard, you can get good grades. =If you don’t study hard, you cannot get good grades. ◆ Get up quickly, or you’ll be late. =If you get up quickly, you’ll not be late. =If you don’t get up quickly, you’ll be late. 二、）and连接主语