I是代词,一般在句子中作主语,后面接谓语(即系动词或动词或助动词)。
如I was an engineer\ I study music\ i don't know。
I am则是主谓结构,i是主语,am是系动词,后面可接名词、形容词、动词ing或ed形式、介词、副词等。
如i am a student\ i am sorry\ i am studying music\ i am from Poland\ iam here。
1、'Don't you know who I am?' she stormed.
“你不知道我是谁吗?”她怒喝道。
《牛津高阶英汉双解词典》
2、I am the youngest of four sisters.
我是四姐妹当中最小的。
《牛津高阶英汉双解词典》
3、If you need anything, I am at your service.
您要是需要什么,请尽管吩咐。
《牛津高阶英汉双解词典》
4、I am new to the town.
我刚刚来到这座小镇。
《牛津高阶英汉双解词典》
5、As far as I am concerned, you can do what you like.
就我而言,你想干什么就可以干什么。
《牛津高阶英汉双解词典》