We use the active voice whenever we can. We use only the passive voice:

• when we don't know who performs the action;

EXAMPLE: The bank was broken into last night.

• when we know or it is important to know who performs an action.

EXAMPLE: This painting was done by my grandmother.

• when the action itself is more important than the doer.

EXAMPLE: Siblings were tragically killed in a road accident.

• when we are interested only in what happens rather than who or what did it.

EXAMPLE: The giant snake was killed in that village.

• when we choose not to name the one who performs the action.

EXAMPLE: The work was poorly done.

• when it is not important to know who does, or did the action;

EXAMPLE: All these wares were imported from Hong Kong.

• when we don't want to take responsibility for something;

EXAMPLE: The matter is currently dealt with by someone.

• when we wish to emphasize the person or thing acted on rather than the one who does it.

EXAMPLE: John was presented with a bravery award yesterday.