What verb tense to use with the adverbial clause 'until'?
I had been swimming until nine o'clock yesterday
I swam until nine o'clock yesterday
I was swimming until nine o'clock yesterday
I had swum until nine o'clock yesterday
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You can use most tenses, except present continuous or present perfect.
I swam until 9pm
I was swimming until 9pm
I had been swimming until 9pm
But past perfect is not for general use.
And in the future
I will swim until 9pm
I will be swimming until 9pm
You can use the present to talk about everyday activities
Every day after work, I swim until 9pm
the difference between "swam" and "was swimming" is pretty minor. Just the usual implications of a continuous, temporary, ongoing activity.