| occasionally(expression, adverb, time, moment, rare) |
| sometimes(expression, adverb, time, moment, rare) |
| on occasion(expression, idiom, adverb, time, moment) |
| now and again(expression, idiom, adverb, time, moment) |
| infrequently(expression, adverb, time, moment, rare) |
| intermittently(expression, adverb, time, rare, variable) |
| at times(expression, idiom, adverb, time, moment) |
| every so often(expression, idiom, adverb, time, moment) |
| once in a while(expression, idiom, adverb, time, moment) |
| sporadically(expression, adverb, time, rare, variable) |
| from time to time(expression, idiom, adverb, time, moment) |
| off and on(verb, expression, adverb, phrasal verb, time) |
| once again |
| at intervals(expression, adverb, time, rare, frequency) |
| ever and again(expression, idiom, adverb, time, moment) |
| every once in a while(expression, adverb, time, moment, rare) |
| once and again(expression, idiom, adverb, time, moment) |
| periodically(expression, adverb, time, rare, frequency) |
| betweentimes(expression, time, moment, rare, frequency) |
| betweenwhiles(expression, time, moment, rare, frequency) |