Verb
be my guest (imperative)
(idiomatic) Do as you wish; go ahead; help yourself; go for it!
If you want to give it a try, be my guest!
Americans have the right to choose to be unarmed and helpless. Be my guest. Ted Nugent
Because they (the Maute group) threatened to go down from the mountains to burn down Marawi? Go ahead, be my guest. We will wait for you there. Walang problema. Rodrigo Duterte
You want to do Olympics just like you do a pro football game or a basketball game? Be my guest. Watch it all fade away. Dick Ebersol