Like a bird ,…… .这里的Like a bird 是做什么成分?I have sth for you.这里

like a bird的like是介词.like a bird 是介宾短语.做状语,比如：
I hope I can fly like a bird.我希望我能像鸟儿一样飞翔
for you是介宾短语.表示目的对象.
比如：
I have a present for you.我有个礼物给你.