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My mother and father have a big bedroom.
My brother has a bike.
I, he, she it → was
They, we, you → were
My mother and father have........
My brother has..........
I,he,she,it-was
You,we,they-were
Was-был,была ,когда подлежащее в един.числе
Were-были,когда подлежащее во множ.числе