Spanish verbs with prepositions

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Some verbs in spanish need to go with a preposition to "complete" their sense. 

For example, 

Acordarse de (To remember to) 
Acostumbrarse a (To get used to)
Dirigirse a (To speak to) 

Some sentences with these examples are: 
Acordarse de pasear al perro (To remember to take the dog for a walk) 
Me acostumbre a hacerlo así. (I got used to do it that way) 
Dirigirse a los invitados. (To speak to the guests) 

Remember not to omit these prepositions or the sentence will lose a lot of its sense! 
Here is a list of a few verbs that go with a preposition  https://www.profedeele.es/actividad/gramatica/verbos-con-preposiciones/ 

Let me know if you have any doubts, I'd be glad to help!