Underline the correct verb tense. 1 Thousands of trees burnt/have burnt down in last summer's forest fires. 2 Ethan has been trying/has tried to call Jessica all afternoon but her line is constantly busy. 3 Jason has cut/has been cutting his finger and it's bleeding. 4 I didn't see/haven't seen Liam for three weeks. Is he OK? 5 A lot of people have attended/attended the charity event yesterday. 6 We have sold/sold 30 tickets for the Red Nose Day concert since this morning.