Function words

EXERCISES:

1. http://www.proprofs.com/quiz-school/story.php?title=test-yourself-content-vs-function-words
2. http://www.grammar-quizzes.com/sent-functioncategory.html
3. https://quizlet.com/89720184/1-1-1-mini-exercise-content-vs-function-words-identify-the-content-words-in-the-following-sentences-flash-cards/
4. http://esl.about.com/od/learningtechniques/a/Content-And-Function-Words.htm