We have learned
2) has lived
3) john has losen
4) hasn't attended
5) have been
6) he has already finished
7) has never tought
8) they have moved
9) haven't bought
10) they have gone out
1. He persisted in trying to solve that difficult problem.Он продолжал попытку решить такую сложную задачу( герундий trying) 2. The results of the experiments must be checked and rechecked before being published.Результаты эксперимента должны быть проверены и перепроверены перед публикацией( being published)3. He was accused of not following the safety rules.Он был обвинен в несоблюдении правил безопасности(<span>following)</span>
А: May
B: might
A: must, might
B: must, mustn't
A: Could
B: must
1-The prisoners are being taken to prison now.