Passive Voice

past actions which happened one after the other

She sealed the letter, put a stamp on it and posted it.

time expressions:

yesterday, last week etc, (how long) ago, then, just now, when, in 1967 etc.

past habit or state

He used to go/went to school on foot.

complete action or event which happened at a stated past time

She called an hour ago. (When? An hour ago.)

action which happened at a definite past time although the time is not mentioned. This action is not connected with the present.

Shakespeare wrote a lot of plays. (Shakespeare is now dead; he won't write again. - period of time now finished)

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