Подбери, если это возможно, к деепричастиям пару с постфиксом -ся.
Пример:
умывая - умываясь
мечтая -
используя -

встретив -

падая -

время past continuous образуется  was/were + глагол с окончанием -ing

was ставим с i, he, she, it

were - с we, you и they

используем это время, когда действие происходило (продолжалось) в определенный момент (или период) в прошлом. например, i was playing computer games at 5 o'clock yesterday. или we were playing computer games since 5 till 6 o'clock yesterday.

либо когда одно действие прервало другое - i was playing computer games when my mother came home.

вопрос: was she playing computer games at 3 o'clock yesterday? - was или were ставим на первое место.

отрицательное предложение: she wasn't playing computer games at 3 o'clock yesterday. they were not playing computer games at 3 o'clock yesterday.