Думаю вы мне поможете. Я уверена что ТЫ справишься с номером 19! Удачи!!! Заранее спасибо!!!
1) We have already been to London. 2) We were in London 5 years ago. 3) They didn't see the Tsar Bell when they were in Moscow. 4) They haven't seen the Tsar Bell yet.