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Review the suspect's alibi for the detective's report. Select ALL the statements that correctly use the past continuous to describe an action that was interrupted when the power went out.
The correct answers are I was taking a shower when the lights suddenly went out. and When the power failed, my cat was sleeping on my face.
We use the past continuous (was/were + verb-ing) for a longer background action that gets interrupted by a shorter action in the past simple (like the power failing).
"I" and "my cat" (singular) both require the auxiliary verb was, not "were". Furthermore, you cannot omit the auxiliary verb "was" before the "-ing" verb.