Hi. I hope this will help. LIKE: The structure of the sentence is usually: VERB + LIKE + NOUN / PRONOUN. He speaks like a native speaker. She looks like a supermodel. AS: The structure of the sentence is usually: AS + SUBJECT + VERB. Nobody sings as she does. They went to the party as they were. It is very common in American English to use LIKE instead of AS. However, it is generally considered informal to use it in this way. We play football like champions do. Another use of AS is to say what the role/function of a person/thing is. He started work as a carpenter. She used the tapestry as a decoration in her living room. LIKE vs. AS: Be careful, in similar sentences that use LIKE and AS, the meanings of each sentence are very different. For example: As your boss, I must warn you to be careful. (I am your boss.) Like your boss, I must warn you to be careful. (I am not your boss, but he/she and I have similar attitudes.)

The confusion arises because Spanish uses "como" for both words in English. "Like" suggests a similarity. Like father, like son. (De tal palo tal astilla) He eats like a wolf. She dresses like a Hollywood star. But "tan ... como" is translated "as ... as": He is as intelligent as his professors. Es tan inteligente como sus profesores. "As" often refers to one's role: As president, he must make difficult decisions. As a sociologist, he watches popular TV shows to judge the national character. As a student, he was not very diligent. "As" often introduces a clause: As I said, she will be late. As it is late, I must leave now. Hope this helps.