1. You are playing chess, aren’t you?
Вы (сейчас) играете в шахматы, не так ли? Время Present Continuous. Active voice.
2. These toys are made in Japan.
Эти игрушки делают в Японии. Время Present Simple. Passive voice.
3. The text is being translated at the moment.
Текст переводят в настоящий момент. Время Present Continuous. Passive voice.
4. The letter had been written before we came.
Письмо было написано до того, как мы пришли.
had been written - время Past Perfect, Passive voice.
came -время Past Simple, Active voice.
5. I am often asked at the lessons.
Меня часто спрашивают на уроках.
Время Present Simple. Passive voice.
6. These books were returned to the library yesterday.
7. Why hasn't your task been done?
8. This room is used only on special occasions.
9. Thousands of new houses are built every year.
10. Usually the street is swept every day, but it wasn't swept yesterday.