The difference between LIKE and AS

 They have the same translation in English but they work differently according to the meaning and to the grammar used.

• LIKE:
• it means "similar to" so it's a comparison: she works like a doctor (similar to a doctor but that person is not a doctor)
• it's used with nouns, pronouns or -ing form: my father is like me
• AS:
• it means "in that position or situation" and it's NOT a comparison but it's REALLY that: she works as a doctor (she's a doctor; it's her job)
• it's followed by noun/pronoun or -ing, but it's very usual to have a sentence (Subject+Verb+Complements): I am a teacher as my father was in his time

If you need more information go to this link: click here or this other link . In both cases you have exercises at the end of the explanation.