考研英语中引起倒装的情况主要有以下几种：
副词引起的倒装
某些副词，如only、seldom、never、hardly、scarcely、rarely、no sooner...than...等，当它们位于句首并修饰状语时，句子需要倒装。例如：
only in this way can we solve the problem.
Never before have I seen such a beautiful scene.
某些固定短语，如so...that、such...that等，当它们位于句首时，句子需要倒装。例如：
So difficult was the task that we had to give up.
Such a heavy box did he carry that he almost broke his back.
介词短语引起的倒装
当介词短语位于句首时，句子需要倒装。例如：
In front of the building stood a tall tree.
On top of the table lies a book.
主系表的倒装
在某些情况下，为了强调或出于语法结构的需要，主系表结构也会发生倒装。例如：
Here comes the bus!
Gone are the days when we could eat anything we wanted.
疑问句和特殊疑问句
一般疑问句和特殊疑问句需要倒装，即将助动词或情态动词放在主语之前。例如：
Are you a student？
How did you solve the problem？
虚拟语气中的倒装
在含有were、should、had的虚拟语气中，如果省略了if，句子需要倒装。例如：
Were I you, I would take the job.
Had you known the truth, you would not have acted like that.
让步状语从句
当连词as表示“虽然、尽管”引导让步状语从句时，句子需要倒装。例如：
As he is old, he is still very active.
Although he is tired, he keeps working.
这些倒装情况在考研英语中较为常见，掌握这些规则有助于更好地理解和分析英语句子结构。建议在平时的学习中多积累和练习，以提高对倒装句的识别和处理能力。