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USE 1 Interrupted Action in
the Past

Use the Past
Progressive
to indicate that a longer action in the past was interrupted. The
interruption is usually an action in the Past Simple. Remember this
can be a real interruption or just an interruption in time.
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USE 2
Specific Time as an Interruption

In USE 1,
described above, the Past
Progressive
is interrupted by an action in the Past Simple. However, you can
also use a specific time as an interruption.
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USE 3 Parallel Actions

When you use
the Past
Progressive
with two actions in the same sentence, it expresses the idea that
both actions were happening at the same time. The actions are
parallel.
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USE 4 Atmosphere
In English we often use a series of Parallel Actions to describe
atmosphere in the past.
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USE 5 Repetition and
Irritation with "Always"

The Past
Progressive
with words such as always or constantly expresses the
idea that something irritating or shocking often happened in the
past. The concept is very similar to the expression used to
but with negative emotion. Remember to put the words always
or constantly between "be" and "verb+ing."
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ACTIVE / PASSIVE Past
Progressive
EXAMPLES:
The boy was helping the customer when
the policeman came into the store.
ACTIVE
The customer was being helped by the
boy
when the
policemancame
into the store.
PASSIVE
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