GRAMMAR SITES--Rules and Examples

This is the Purdue OWL Writing Lab Site map--you can choose your topic -- all about writing, grammar.  There is specific writing like scientific reports.
http://owl.english.purdue.edu/sitemap/

This is a link to Purdue OWL Writing Lab Site which has grammar exercises.  They are not online--you have to write them out.

http://owl.english.purdue.edu/exercises/2/

Adverbs of Frequency (how often?)

http://www.eslgold.com/grammar/frequency_adverbs.html

http://esl.about.com/library/grammar/blgr_adverbs_frequency.htm

Exercises:
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency.htm
http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverbs_of_frequency1.htm
http://www.myenglishpages.com/site_php_files/grammar-exercise-adverbs-frequency.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-28491.php

Adverbs of Degree (how much? 'very, really, etc.')

http://busyteacher.org/15101-adverbs-of-degree-3-very-active-exercises.html

The site below contains some lists of adverbs.
http://www.grammar-quizzes.com/adv_degree.html#sectionOne

Exercises:
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4102.php
http://perso.wanadoo.es/autoenglish/gr.degree.i.htm
http://www.usingenglish.com/quizzes/361.html
http://www.englishgrammar.org/adverbs-degree-exercise/


Adverbs of Manner

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/advman.htm

The site below also contains a list of adverbs.
http://www.englishclub.com/vocabulary/adverbs-manner.htm

Exercises:
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-18895.php
http://www.learnenglish.de/Games/Adverbs/Adverbs.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/advman1.htm
http://www.ego4u.com/en/cram-up/grammar/word-order/exercises?08