as\like的区别

汉语和英语在对待词性的问题上存在巨大的差异。这也是我们觉得英语难学的一个重要原因。汉字的词性，是由这个字在句子或词语中所处的位置决定的。换句话说，每个汉字几乎可以在不同的情况下充当任何词性。这一点在汉语字典中可以得到佐证。翻看汉语字典，我们会发现每个字后面都没有标注词性，因为根本没有标注的必要。而英语则不同。英文字典里，每个单词后面肯定会有词性标注。英语在遣词造句的时候，必须要考虑单词的词性。在遇到容易混淆的单词的时候，也要从词性入手进行辨析。

下面以as和like为例进行辨析。

as可以是介词、副词或连词；like可以是介词、动词，在非正式情况下，还可以做连词。like作为动词的时候，解释为“喜欢”，和as有明显区别。

• 当作为介词时，as可以解释为“如同；作为”，偏向于“作为”的解释。在说到关于职业和功能的时候一般使用as，
  例如：
  I worked as a shop assistant for 2 years when I was a student.
  He used his shoe as a hammer to hang the picture up.
  而like可以解释为“类似”，偏重于相似性。
  例如：
  I've been working like a dog all afternoon.
  None of my brothers are much like me.
  She looks just like her mother.
• as可以作为副词，like不能当作副词。“ as 形容词 as ”格式就是as作为副词的常用表达方式。
  例如：
  He's not as tall as his brother.
  She ran as fast as she could.
• as可以做连词，like在非正式情况下也可做连词。as作为连词时可以解释为“就像”。
  例如：
  He went to Cambridge University, as his father had before him.
  She's a talented writer, as most of her family are.
  非正式情况下，like可作为连词，解释为“好像”。
  例如：
  It looks like it's going to rain.
  但是在书面语表达中，要用“ as if ”或“ as though ”来代替“ like ”。
  例如：
  You look as if you've seen a ghost.
  You talk as though we're never going to see each other again.

辨析完毕。