VOA一分钟英语：辨析近义词 like 和 as

单词 “like” 和 “as” 都可以表示 “相似” 的意思，但在使用中它们是有区别的。想要表示 “外貌相似”，应该用哪个词？在描述一个人的身份、职业时，又该用哪个词？
 
Hi, I'm Tim from BBC Learning English. Here to tell you about two words we use to say that things are similar.
We use like as a preposition before a noun or pronoun and it means 'similar to'. He ran like the wind. Not he ran as the wind.
We use like, and not as to compare appearances. This house looks like a castle.
As can be used as a preposition. It means 'in the role of'. Dan, as your friend, I have to say you're not a good singer.
We often use as to talk about people's jobs. I work as an actor.
Be careful using like and as because the meaning can change. 'As your brother, I'll try to help you.' means I actually am your brother. Change it to like, and it means I'm not your brother but I want to act in a similar way.
 
用法总结
1 “Like” 作介词时可修饰名词或代词，描述人或物 “像，与...相似”。
He ran like the wind.
This house looks like a castle.
 
2 “As” 作介词时，意思是 “作为，以…身份”。 
Dan, as your friend, I have to say you're not a good singer.
I work as an actor.
注意："like" 和 "as" 互换使用后，可能会改变句子的含义。
As your brother, I'll try to help you.   作为你的哥哥，我会尽力帮你。（我是你的哥哥）
Like your brother, I'll try to help you. 我会像你哥哥那样尽力帮你。（我不是你的哥哥）