English Skills with Readings 8th Edition by John Langan

Exercise 21

For each of the italicized verbs, fi ll in the three missing forms in the following order:
(a) Present tense, which takes an -s ending when the subject is he, she, it, or any one person or thing (see pages 459 460)
(b) Past tense
(c) Past participle the form that goes with the helping verb have, has, or had
Martha likes to eat. She (a) __________ as continuously as some people smoke. Once she (b) a large pack of cookies in half an hour. Even if she has (c) __________ a heavy meal, she often starts munching snacks right afterward.