Как и почему изменилась кадровая политика центральной власти в национальных республиках?

1) We speak English every day, yesterday we spoke English too.

2) My aunt comes to see us every weekend, last weekend she came to see us too.

3) The children swim in the swimming pool every Friday, last Friday they swam in the swimming pool too.

4) Meg sings for her friends every evening, yesterday evening she sang for her friends too.