When you wish to say how often you do something, you can use certain Adverbs of Time (e.g. immer, nie).
Emma macht immer die Hausaufgaben. (every time)
Lotte macht nie die Hausaufgaben. (never)
These adverbs are usually placed directly after the conjugated verb.
Grammatical terms in German:
das Adverb: An adverb describes when, where or how something happens. It refers to another word in the sentence (e.g. a verb or adjective) or to the whole sentence.