Using inversion:If I were a swallow, I could fly about carefree

Using inversion:
If I were a swallow, I could fly about carefree and liberty in the cloudless blue sky.
【正确答案】：Were I a swallow, I could fly about carefree and liberty in the cloudless blue sky.
【题目解析】：Were-虚拟式改为倒装句时把if去掉，were提前到主语前。