Cambridge Dictionary gave the following rules that will help us learn how to use “as” and “like”
As and like are prepositions or conjunctions. The prepositions as and like have different meanings. As + noun means ‘in the role of’, like + noun means ‘similar to’ or ‘in the same way as’.
A. We use like (but not as) to compare two things:
Example: She’s got a headache like me.
When we compare appearance or behavior, we use like, not as:
Example: That house looks like a castle.
B. As is commonly used to talk about jobs:
Example: He worked for a long time as a teacher in Africa.
The conjunctions as and like have the same meaning when used in comparisons. Like is a little more informal.
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