А B
с
D
an action which happened at
a specific time in the past
(stated or implied)
actions which happened one
after the other in the past
an action which was
happening at a specific time
in the past
two actions which were
happening at the same time
in the past
an action which was
happening in the past when
another action interrupted it
background information to
a story
see pp. GR3-GR4
E
F​

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