Final -ed: Perfect Tenses The perfect tenses combine a form of the auxiliary to have with the past participle of a main verb. When the main verb is regular, the past participle ends in -ed. If Einstein had lived longer, he might have worked for a test ban treaty. Application 5

CONTENTS MAIN PAGE 10.1 Pretest 10.2 Your Writing 10.3 Recognizing Final -ed 10.4 Simple Past Tense 10.5 Perfect Tenses 10.6 Passive Voices 10.7 Past Participles that Act as Modifiers 10.8 Avoiding Incorrect -ed Endings 10.9 Review & Practice Part 1 10.9 Review & Practice Part 2 10.10 Fun With Grammar 10.11 Return to Your Writing 10.12 Mastery Test