Have : indicates possession or ownership of something-> I have a pen : I, the speaker, possess the penGET : have so many meanings. The normal meaning is To acquire or obtain something-> I am going to get a coffee : I am going to acquire a coffeeBUT GET can also be use to indicate possession or ownership, but it implies a more active process than have-> My mom got a new car on Saturday. : The meaning is that my mom worked a lot actively to obtain this new carThe difference of My mom got a new car and My mom has a new car : get include a process of obtaining a possession, have include an already etablished ownership

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