by

to travel by train

to pay by credit card

to communicate by email

to learn by heart

to work by hand

to send by post

to go by bus

to cook by recipe

to enter by force

The illicit economy robs legitimate markets by undercutting legitimate businesses.

Netanyahu says they are cooked up by political opponents.

Wallace had built his political career by exploiting divisions between us.

Will you travel by sea or by air?

Is it feasible to finish the work by Christmas?

He had a drive by last week.

Faculty evaluations are conducted by the students.

China has 260 million migrant workers by 2012.

Thanks. Last auditions are Thursday, so I gotta get in by Thursday.

Of course, Copenhagen has pretty clean air, even by European standards.