Why do we need to know O, as, a,amos, an in spanish

In spanish, it is grammatically correct to have more than one negative in a sentence.

Listen to what charlie will do on his day off depending on the weather and answer the following question. 00: 00/00: 58 click here for the audio. si no llueve, charlie irá a caminar con sus amigos por el centro. true false

Ana / dibujar / muy bien. correct verb tense? ?