Перевести на (действительный и страдательный залог) 1. письмо написали вчера. 2. ключи потеряли в библиотеке. 3. ёлку нарядили 20 декабря. 4. окна не помыли на неделе. 5. еду купили вечером. 6. работа не была сделана вчера.

1) The letter was written yesterday

2) Keys were lost in a library

3) Christmas tree was decorated on December 20th

4) Windows were not washed last week

5) Food was bought in the evening

6) Homework was not done yesterday

по-моему, так все же правильней

1) The letter was written yesterday

2) Keys were lost in a library

3) Christmas tree was decorated on December 20

4) Windows were not washed last week

5) Food was bought in the evening

6) Homework wasn't  done yesterday