The imperfect tense is used for past actions that are not seen as completed.
Jugabamos al tenis, because it would be in the nosotros form and past tense.
Answer:
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Translation: <u>It's</u><u> </u><u>eleven</u><u> </u><u>fifteen</u><u> </u><u>at</u><u> </u><u>night</u><u>.</u>