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Affirmative sentences:
Subject + verb in past + complement.
Examples:
She was an actress
I ate fish yesterday
He stayed at home all the weekend
We went to the cinema last Friday
Negative sentences with verb to be:
Subject+ wasn't/weren't+complement
Example
She wasn't in her house last Monday
Carlos and Maria weren't comfortable in the family meeting
Negative sentences with auxillary verb:
Subject+ auxillary verb ( to do) + not+ infinitive verb + complement:
Examples:
They didn't want to go to the party
Sara didn't buy a new cellphone