1) Peter has already done the home task.2) Students are writing a test now.3) The children were dancing when I came.4) We study many subjects. (если просто учим) We have studied many subjects.(если выучили, то есть показан результат)5) I will go to the concert next week.6) My friend came to see me last night.7) When I went out the sun was shining brightly.8) My hair is dark brown.9) Does your son speak English well?10) Where does Mark and Jane live?