We use the past perfect to talk about an action that happened before another action in the past.
Mike had already left when we arrived at the party.(We arrived after Mike left.)
We use the past perfect continuous:
for a past action which started and finished in the past before another past action, putting emphasis on the duration(usually by using for or since). He had been driving for an hour when he realised he was on the wrong road.
for an action which lasted for some time in the past and whose result was visible in the past. Her clothes were wet because she had been walking in the rain.
Note: The past perfect continuous is the past equivalent of the present perfect continuous.
Time expressions: for, since, how long, before, after, already, just, when, by, by the time, until etc.
We use the past perfect to talk about an action that happened before another action in the past.Mike had already left when we arrived at the party.(We arrived after Mike left.)We use the past perfect continuous:for a past action which started and finished in the past before another past action, putting emphasis on the duration(usually by using for or since). He had been driving for an hour when he realised he was on the wrong road.for an action which lasted for some time in the past and whose result was visible in the past. Her clothes were wet because she had been walking in the rain.Note: The past perfect continuous is the past equivalent of the present perfect continuous.Time expressions: for, since, how long, before, after, already, just, when, by, by the time, until etc.
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