We use the Past Perfect Continuous to show that something started in the past and continued up until another time in the past. "For five minutes" and "for two weeks" are both durations which can be used with the Past Perfect Continuous.
Examples:
- They had been talking for over an hour before Tony arrived.
- She had been working at that company for three years when it went out of business.
- How long had you been waiting to get on the bus?
- Mike wanted to sit down because he had been standing all day at work.
Using the Past Perfect Continuous before another action in the past is a good way to show cause and effect.
Examples:
- Jason was tired because he had been jogging.
- Sam gained weight because he had been overeating.
- Betty failed the final test because she had not been attending class.
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