AS and LIKE are both used to describe similarities, but have different grammatical uses. AS is used before prepositional phrases and to connect two clauses, while LIKE is used in informal styles to connect clauses instead of AS. LIKE is also used informally instead of AS IF. In formal styles, LIKE should not be used as a conjunction.

2. AS vs LIKE

3. When we want to say that people, things, actions or
situations are similar to each other, we can use AS
or LIKE, depending on the grammar of the sentence
AS is also used before prepositional expressions:
e.g.: In 2000, as in 2002, there was high unemploy-
ment.
e.g.: I´m very like my brother.
My sister isn´t much like me.
AS is a conjunction – it is followed by a clause, with
a subject and verb.
e.g.: She´s a fine cooker, as her mother used to be.

4. In informal American English, like is very often used as
a conjunction instead of as.
e.g.: Nobody loved her like I did.
This usage is becoming common in British English. It is
still considered ‘incorrect’ in formal styles of British and
American English. Like is also often used, in an informal
style, instead of as if.
e.g.: He acted like he owned the place.