My mother and father has /have a big bedroommy brother has/have a bike в каких ситуациях was в каких случаях were ​

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