Grammar workesheet present perfect positives, negatives

3 Jennifer hasn't finished her homework. 4 They have met the president. 5 No, we haven't. 6 Has Roberto visited Vancouver? 7 Yes, he has.8 Mrs. Smith hasn't read the book.9 He has been a teacher.10 Have you been to Jail? 11 I haven't cleaned my room.12 No, they haven't. 13 Has she been sick?14 Has he swum in the ocean? 15 They haven't arrived. 16 Where have they been ? 17 We have lived here for a year. 18 What has he done? 19 It hasn't rained for a long time. 20 Who has finished the homework?