As和like的区别

You can use both as and like to say that things are similar.      As和like均可表示相似。ikei

Like 是介词，置于名词和代词前

eg.  He has blue eyes like me.  他和我一样有一对蓝眼睛。

As 是连词或副词，置于从句、另一副词或以介词引导的从句前

eg.  1. She enjoys all kinds of music,as I do.她和我一样什么音乐都喜欢。

2. Repeat these five steps,as in the last exercise.照前面的联系一样，重复这五个步骤。

在非正式英语中，Like常常代替as，用作连词或者副词。

   eg.  1. Nobody understands him like I do.谁都不像我那么了解他。

       2. I do not want to upset him again like before.我不愿意再像过去那样使他扫兴。

Like也可用以代替 as if

   eg.  1. It looks like we are going to be late.看来我们要迟到了。

Like的这类用法很常见，但在规范的书面英语中并不认为正确。