Final answer:
After 'me gustaba/gustaban,' if there is a verb that follows, it should remain in the infinitive form. This is because the 'gustar' construction is expressing liking an action or a noun.
Step-by-step explanation:
After you say "me gustaba" if the subject is singular, or "me gustaban" if the subject is plural, the verb that follows should be in the infinitive form because gustar functions differently from most English verbs. For example, we say "Me gustaba bailar" (I liked to dance) or "Me gustaban las manzanas" (I liked apples). After gustar, you don't conjugate the second verb if it exists; it remains in the infinitive because what is actually liked is the act of doing something (bailar), or the likeable thing is a noun (las manzanas).