1.           We usually lit our houses with candles.

We used to light our houses with candles.

2.           Sailors were usually guided by strars.

 Sailors used to be guided by strars.

3.           People usually cooked on wood fires.

People used to cook on wood fires.

4.           It usually took me several days to go to London.

It used to take me several days to go to London.

5.           Books were usually written by hand.

Books used to be written by hand.

6.           People usually traveled on foot.

People used to travel on foot.

7.           They usually made their own bread.

They used to make their own bread.