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Ellen: OK, Philip. This is your third cup of coffee. We should get to work, or we won't be finished by dinnertime.
Philip: I guess we must.
Ellen: We must.
.....
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My friend was wondering if there is anything wrong on the fowllowing saying "OK, Philip. This is your third cup of coffee. We should get to work, or we won't be finished by dinnertime. "

i think it's ok..pls check it for me

thanks :)