While designed for college students, this review of adverbs could be used in a high school classroom as well. The worksheet begins with a detailed overview of adverbs which is followed by a six-question activity.

This page focuses on verbs including definitions, action and non-action verbs, verb tenses, and verb moods with examples for all of the above.

The Tongue Untied is a guide to grammar, punctuation, and style for journalists, but it has great information on the direct object. The site provides numerous examples along with information on usage and tips for recognizing direct objects.