Put the verbs in brackets into the Present Perfect or the Past Simple. Pay attention to the underlined words.
1.I ( already do) my homework.2.I ( do) my homework yesterday.3.I (live) in London in 2015.4.We (live) in Moscow since 2010.5.He ( be) in the USA last summer.6.They ( be) in Italy for a week.7.You ( play) the piano today?8.She ( play) the piano yesterday?9.You ( ever see) the eruption of a volcano?10.We ( see) the eruption of a volcano two years ago.11.I ( not yet cook ) dinner.12.She ( not cook) dinner yesterday.