which situation we use do instead of are

When there is a verb in simple present tense then we use "do" instead of "are" with we,you,they,plural subject. For ex:- Do we teach? √ Are we teach? ×

in simple presentence if the sentence have verb we use do with you,we they eg: do you have pen but if the sentence does not have verb we use are with you,we and they eg: are they good people