They(play)tennis в 4 временах past simple,past continuous,past perfect,past perfect continuous.
1.They played tennis. - Past Simple ( Прошедшее Простое). 2.They were playing tennis. - Past Continuous (Прошедшее Продолженное). 3.They had played tennis. Past Perfect (Прошедшее Совершенное) 4.They had been playing tennis. - Past Perfect Continious (Прошедшее Совершенное Продолженное)
Past simple: they played tennis Past continuous: they were playing tennis Past perfect: they had played tennis Past perfect progressive: they had been playing tennis