- tell: to be told

example: Active: They tell lies. Passive: Lies are told.

- is telling: to be being told

example: Active: He's telling a lie. Passive: A lie is being told.

- told: to be told

example: Active: He told her. Passive: She was told.

- was telling: to be being told

example: Active: He was telling her. Passive: She was being told.

- has told: has been told

example: Active: He has told her. Passive: She has been told.

- had told: had been told (same as above)

example: Active: He had told her. Passive: She had been told.

- to tell: (what exactly is the context?, if as an infinitive then it can take any form, if it's something like:

example: Active: He was told to tell her. Passive: She was told. < Not sure

- will have told: will have been told

example: Active: He will have told her. Passive: She will have been told.

- must tell: must be told

example: Active: He must tell her. Passive: She must be told.

Try to figure out what to do to change into passive using these examples above, if you still don't get it let us know.

Yoong Liat wrote:

example: Active: He was told to tell her. Isn't the above sentence 'Passive' rather than 'Active'?

Hi,

Just a word of advice …  

When we apply passive voice to a context, we should have an awareness if the intended context can receive the passive voice. Theoretically, at least in exercise, we can change active to passive voice with any verb. However, this is not always true in real life. Passive voice should be used with discretion and proper context.  For instance, if I say “Mary was given plenty of warning before she was fired for her tardiness”, I intended Mary as my subject and the emphasis is on her. We don't have t ostate the name of the person who carried out the firing. In the active voice, we must state the subject who carried out the firing of Mary, whom in this case is the recipient of the act.   Example: Mary’s manager gave her plenty of warning for her tardiness before firing her.