Gramática: pronombres directos

¿Qué hago con mi hermanita?

Here you're being introduced to direct object pronouns.  Notice that when you help or take care of your younger sister, you aren't taking care of ella, but instead of la.  It's the same in English - you don't take care of she, you take care of her.  That's because you're the one helping, and your sister's the one receiving the help. 

Notice too that in Spanish the object pronoun goes in front of the verb.  If we did the same in English, it would look like Her I help, Her I visit, Her I take to school, etc.

Direct object pronouns:

 me  us  
 you  (informal)  
 you  (formal) 
lo, la
 you-all (informal) 
 you-all (formal) 
 los, las
 lo, la

 los, las

Use direct pronouns when you're doing something directly affecting another person or thing.  

When you use the verbs below, the person who's receiving will be the direct object:

 call  llamar
 entertain  entretener
 lift  levantar
 help  ayudar
 hug  abrazar
 invite invitar
 kiss  besar
 know  conocer
 make cry  hacer llorar
 make laugh  hacer reír
 make smile  hacer sonreír
 see  ver
 take (somewhere)  llevar
 take care of  cuidar
 trick  engañar
 visit  visitar
 wake up  despertar