Always- usually- sometimes- rarely- never

General rule: Subject + adverb of frequency+ main verb.

He never gets here on time.

With ‘to be’: subject +to be+ adverb.

The class are always so well-behaved.

 

Sentence position- ‘Sometimes’

‘Sometimes’ is more flexible. It can go at the beginning of the sentence, before the main verb, or at the end.

 

The negative form goes before the adverb.

Do not use a negative form and negative adverb (never, rarely, hardly ever)

It is not never rainy here. (incorrect sentence)