简单句变复合句

很多孩子写PET作文时，句子总像“豆腐块”：主谓宾齐全，但缺乏层次和逻辑，阅卷老师一眼看出语言稚嫩。本文直击痛点，教你用可操作的方法，把简单句自然升级为符合PET写作评分标准的复合句。

一、先读懂什么是“复合句”

复合句 ≠ 复杂句，而是一个主句 + 至少一个从句（如时间、原因、条件、定语等），靠从属连词（because, when, which, that）或关系代词自然连接。关键在逻辑清晰、不堆砌。

✅ 正确示范：

• Simple: I like dogs. They are friendly.
  Compound/Complex: I like dogs because they are friendly.（原因状语从句）
• Simple: The girl is my classmate. She wears glasses.
  Complex: The girl who wears glasses is my classmate.（定语从句）

学习方法：每天挑2个简单句，用“because / when / if / who / which”尝试改写；对照PET真题范文，圈出所有复合句，分析其连接逻辑。

二、三类高频从句，PET必会

PET写作中，90%的复合句来自这三类——掌握它们，就能覆盖书信、故事、观点类所有题型。

1. 原因状语从句（because / as / since）

• Simple: Tom missed the bus. He got up late.
  Complex: Tom missed the bus because he got up late.

2. 时间状语从句（when / before / after）

• Simple: I finished my homework. Then I watched TV.
  Complex: I watched TV after I finished my homework.

3. 定语从句（who / which / that）

• Simple: This is a book. My teacher gave it to me.
  Complex: This is a book that my teacher gave to me.

做题步骤：① 找出两个有逻辑关联的简单句；② 判断关系（谁导致谁？谁发生在前？哪个名词需要描述？）；③ 选对连接词；④ 检查动词时态一致（如主句过去时，从句也需过去时）。

三、用好“并列连词”，轻松跨出第一步

如果从句暂时有困难，先用FANBOYS（for, and, nor, but, or, yet, so）升级为并列复合句——这是PET最安全、最易提分的突破口！

• Simple: It was raining. We stayed indoors.
  Compound: It was raining, so we stayed indoors.
• Simple: Anna studied hard. She passed the test.
  Compound: Anna studied hard, so she passed the test.

? 小技巧：逗号 + so/but/and 是PET阅卷人眼中的“语言成熟信号”。每篇作文确保出现3–4处，不重复、不滥用。

四、避免三大“假复合句”雷区

这些写法看似高级，实则扣分！PET强调准确 > 花哨：

• ❌ 错误嵌套： “I think that because it was cold, so we closed the window.”（because 和 so 冗余）
  ✅ 改正： “It was cold, so we closed the window.” 或 “Because it was cold, we closed the window.”
• ❌ 关系代词误用： “The boy which helped me is my neighbour.”（指人只能用 who/that）
  ✅ 改正： “The boy who helped me is my neighbour.”
• ❌ 主谓不一致： “The books that is on the desk are mine.”（books 是复数）
  ✅ 改正： “The books that are on the desk are mine.”

自查清单：每写完一句复合句，默读三遍：① 连接词是否必要？② 动词形式是否匹配主语？③ 从句是否完整（有主谓）？

五、PET实战：从草稿到高分句

以PET写作Part 3（故事续写）为例，展示升级全过程：

• 原始草稿： “Lily went to the park. She saw a dog. The dog was black. She liked it.”
• 升级一步（并列）： “Lily went to the park, and she saw a black dog.”
• 升级两步（定语+原因）： “Lily went to the park and saw a black dog that was playing with a ball, so she liked it immediately.”

每日小任务：从本周PET模拟卷中抄下5个简单句，按上述三步法升级，拍照发给老师批注——进步，就藏在这一笔一划的转化里。

记住：从简单句到复合句，不是追求“更难”，而是追求“更准、更顺、更有想法”。每一个because、every who、每次逗号后的so，都在悄悄告诉阅卷老师：“我已准备好，用英语思考。”坚持21天，你会惊喜地发现——句子自己长出了翅膀。加油，你写的不只是句子，是通往更广阔世界的通行证！