Usually and never are adverbs of frequency. They tell us how often an action happens.
Adverbs of frequency include:
0%  | 
    never | 
|---|---|
| 
 |  | 
    hardly ever | 
|  | 
    sometimes | 
|  | 
    often | 
|  | 
    usually | 
100%  | 
    always | 
Adverbs of frequency go before the verb in a sentence.
Adverbs of frequency go after the verb to be.
Some adverbs of frequency can go at the beginning or the end of a sentence. These adverbs are normally, usually and sometimes.
Some adverbs of frequency cannot normally go at the beginning of a sentence. These adverbs are always, never and rarely.
In a question, the adverb of frequency goes after the subject.