Past: The manager was in his office a few minutes ago.
Future: The manager will be in his office to-morrow at ten o'clock.
Present Perfect: The manager has been in his office all the morning. (It is still morning.)
Past Perfect: The manager had been in his office only a few moments when the president arrived.
Future Perfect: In about five minutes the manager will have been in the president's office exactly three hours.
1. The cashier opens the safe in the morning.
2. The mechanic earns good wages.
3. The buyer leaves to-night.
4. The bookkeeper makes out the statements.
5. The correspondent writes the booklets.