省略if的虚拟语气if i were a bird可以省略成were i a bird吗

是的,你是正确的
比如：
Were I Tom,I would refuse.如果我是汤姆,我会拒绝.
If he were here,she would agree too.
→Were she here,she would agree too.
假若明天下雨,我们只好推迟这场比赛.
If it should rain tomorrow,we should have to put off the match.
→Should it rain tomorrow,we should have to put off the match.
要是我们当时早点找到他的话,我们就可以救活他.
If we had found him earlier we could have saved his life.
→Had we found him earlier we could have saved his life.