Очень нужна помощь Надо записать выделенные слова в правильной форме

b. I have never been to Siberia before. c. What do you do at work exactly? d. Karen used to have short hair once. e. I'm just about to leave, so I can't talk now. f. It has been a long time for me since I last went to the theatre. g. When did Romans invade Britain? h. I don't think it will rain tomorrow. i. Does this suitcase belong to you? j. When the necessary amount of money is saved, I'm going to buy a new computer.