以下是一些常见英语句式变换技巧及示例：

1. 简单句变复合句
原句：She studies English.
变换：She who is a diligent student studies English.

2. 主动语态变被动语态
原句：The teacher praised the student.
变换：The student was praised by the teacher.

3. 陈述句变强调句
原句：I saw a beautiful sunset.
变换：It was a beautiful sunset that I saw.

4. 直接引语变间接引语
原句："I will finish this project today," he said.
变换：He said that he would finish the project that day.

5. 并列句变主从复合句
原句：It was raining. We stayed home.
变换：It was raining, so we stayed home.

6. 一般疑问句变特殊疑问句
原句：Do you like coffee?
变换：What do you think about coffee?

7. 祈使句变委婉表达
原句：Please be quiet.
变换：Would you mind keeping quiet?

8. 感叹句变陈述句
原句：What a beautiful day!
变换：Today is a particularly beautiful day.

9. 定语从句简化
原句：The book that I borrowed is interesting.
变换：The book I borrowed is interesting.

10. 倒装句式
原句：She rarely goes out at night.
变换：Rarely does she go out at night.

建议根据具体语境选择合适句式，注意保持逻辑连贯和语法正确。需要具体分析作文时，可提供文本进行针对性修改。