2015-09-07
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Study the table of the English tenses above and grammar references.
Revision 1: Study the situations when the past perfect-continuous tense is used.
a) Emphasis is put on the duration of an action which started and finished in the past before another past action or by a stated time in the past, usually with since or for. Situations answer the question ‘How long?’
She had been working on the computer for an hour before he came to help her.
She had been writing an article since morning by the time he came.
How long had you been waiting for the bus before it arrived?
Had Peter been driving for two hours before he had an accident?
We had been playing tennis for half an hour when it started to rain.
