Your sentence
A+mí+me+gusta,+pero+a+él+no.
Words in this sentence
a
to; by; at; Used before words referring to people, pets, or personified objects or places that function as direct objects: personal a.
Preposition
gustar
translated as "to like", analyzable in structure as "to please" [with dative ‘someone’] (the thing being liked is the subject, while the "liker" is in the dative case ("indirect object")). See the usage notes for more. Compare similar structures in Italian piacere, Romanian plăcea, German gefallen and Russian нравиться (nravitʹsja).; to like in a general sense; to like romantically; to like the taste of (some food); to want, to please; to like, to enjoy; to want, to desire; to taste, to try (determine the flavour of something by putting it in one's mouth); to experiment, to try
Verb
él
he, him, masculine personal third person subject and disjunctive pronoun (used as a subject and after prepositions); it, masculine non-personal third-person subject and disjunctive pronoun (usually used after prepositions to refer to masculine nouns)
Pronoun