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Capital Community College Foundation
Guide to Grammar and Writing: Writing Concise Sentences
Why write five paragraphs when you can say what you want to say in two? Learn how to make the most of your words and sentences to get your point across without being too wordy.
SUNY Empire State College
Empire State College: Writer's Complex: Grammar Interactive Exercises
This site has an index to interactive exercises testing knowledge of various types of grammar. Some categories offer basic and advanced exercises. Answers are explained.