The following table is rather pragmatic just because it lists the deliberate distinctions among the various adverbs of frequency.

 % Adverbs of frequency Example
 100% Always I always study after class.
 90% Usually I usually walk to work.
 80% Normally/Generally I normally get good marks.
 70% Often/Frequently I often read in bed at night.
 50% Sometimes I sometimes sing in the shower.
 30% Occasionally I occasionally go to bed late.
 10% Seldom I seldom put salt on my food.
 5% Hardly ever/Barely/Rarely I hardly ever get angry.
 0% Never Vegetarians never eat meat.