Choose the right modal verbs. passenger: excuse me! (should/may) i leav my trunk here? will that be ok? clerk: i am afraid you(can't/shouldn't).you (should/can)keep your luggage with you. passenger: i (don't have to/can't)carry it round all the time.it is too heavy for me! clerk: you(are to/can)get a trolley. pessenger: i(needn't/can't)see any.where(should/can)i fide one of these trolleys? clerk: i am sure you will find some outside the main entrance. pessenger: you (should/are to)be more polite and helpful to your clients. clerk: well.it you wait for a moment,i will see if i(can/may)call a porter for you. pessenger: thank you,i really(can't/mustn't)have taken such a heavy trunk.