Usage of As v/s Like

Mostly in sentence correction questions, the presence of either like or as refers to the comparison. Let's discuss the usage of like and as in detail.

Like: As most of us aware that, Like always follows by either Noun or Pronoun. But three important things to keep in mind are
1) The sentence should make sense both logically and grammatically. For example, you cannot compare the taste of apples to the size of the oranges right.
2) Like, should never be used to provide the examples.
3) Usage should not create an unambiguous comparison. For example, Siri needs a guitar like Robert. This sentence leads to two possible scenario's.
a) Both Siri and Robert need a guitar.
b) Siri needs a guitar like the one, which Robert holds.

As: Whenever you see As in a sentence, make sure it should convey any one of the following four scenario's. As can be used to,
1) Provide a comparison between the two clauses.
2) Provide two simultaneous actions. For example, As I walked in the subway, I saw a museum.
3) Provide a reason for the action. For example, Ron walks for an hour daily, as he wants to be healthy.
4) To convey the role of a person or thing. For example, Ron has been working in a company, as a researcher.

Hope this helps you to understand the usage of Like v/s As.

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