be my guest
US /biː maɪ ɡɛst/
UK /biː maɪ ɡɛst/

1.
fai pure, prego
used to give someone permission to do something or to accept an offer
:
•
“Can I borrow your pen?” “Be my guest.”
«Posso prendere in prestito la tua penna?» «Fai pure.»
•
If you want to use the computer, be my guest.
Se vuoi usare il computer, fai pure.