考研英语中，虽然不像数学那样有大量公式，但以下是一些常见的公式和表达，它们在写作和阅读理解中尤其重要：
1. 比较级与最高级：more... than... / the most...
2. 时间表达：by the end of... / at the beginning of... / during... / in the middle of...
3. 数字表达：a quarter of / two-thirds of / over 50% / less than 10%
4. 逻辑关系：not only... but also... / in addition to... / on the other hand...
5. 介词搭配：in order to... / because of... / due to... / in front of... / in the back of...
6. 被动语态：be done by... / be done to...
7. 语法结构：it is... that... / there be... / what... is... / so... that...
8. 情态动词：can / could / may / might / must / shall / should / will / would
9. 现在分词与过去分词：doing / done
掌握这些基础表达和语法结构，有助于提高考研英语的写作和阅读水平。
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