Правильно ли выполнено задание по английскому? Какие ошибки?

Put the verbs in brackets into the correct voice and tense-forms. 1) That young singer has had a very good training. He (to sing) for half an hour and never to stop for a moment`s rest. That young singer has had a very good training. He has been singing for half an hour and never stopping for a moment`s rest. 2) Our reply (to send) to you as soon as all the dates (to fix) finally. Some of them (to consider) yet. Our reply will be sent to you as soon as all the dates are fixed finally. Some of them have been under consideration yet. 3) "I (not to see) Ann lately. What she (to do)?" "She just (to take) her finals and (to prepare) to go away for a holiday." "I haven`t seen Ann lately. What does she do?" "She`s just taken her finals and been preparing to go away for a holiday." 4) It`s no use calling for the documents now. They (to prepare) when I (to leave) the office, but I don`t think they (to be) ready yet. It`s no use calling for the documents now. They were being prepared when I left the office, but I don`t think they`ve been ready yet.