1. The word "forest" can be used as both a noun and a verb. 2. The original form of "forest" is "forest," and the plural form is "forests." 3. The past tense of "forest" is "forested." 4. The past participle of "forest" is also "forested." 5. The present continuous tense of "forest" is "foresting." 6. Most of the ancient forests in the world have been destroyed. 7. They forested the mountains with pine trees.