Expressions

Description: Expressions to describe the middle ground between often and occasionally.

Link: http://www.ihbristol.com/useful-english-expressions/example/sometimes/6

Grammar notes

Description: Grammar notes.

Link: http://www.englisch-hilfen.de/en/grammar/adverbien1.htm

Miscellaneous

Description: Miscellaneous exercises.

Link: http://www.myenglishpages.com/site_php_files/grammar-exercise-adverbs-frequency.php

Fill in the blank

Description: Fill in the blank exercise.

Link: https://elt.oup.com/student/solutions/elementary/grammar/grammar_02_012e?cc=mx&selLanguage=en