the main difrence of those word is that sit down you oder him but have seat is use to ypu giving respect to a person

q like this what would i do

in this sentence is and does both are helping verbs so in sentence where situation like this were we use helping verbs then we fast 1st form then 2nd form and does ia the 2form of is

because the sentence is present form then we use first form is the 1st from does

don't werey bro keep it up one day you are great speaker

ok Welcom why not uf you wanna learning English you send me friend rqust on msgengr