sling

18. A/an _______ verb ends in -ed in the past tense and in the past participle. A. being B. action **C. helping (my sec)D. regular

3. The principal parts of a verb are A. present tense, present participle, past tense, past participle. B. base form, helping verb, past participle. ** C. base form, past tense, past participle, future tense. D. present tense, past tense, future tense.

20. Which of the following singular nouns does not form an irregular plural? (my sec) A. mouse B. tooth C. ox ** D. tree