переведите на русский язык, обращая внимание на разные значения глаголов to be, to have, to do.
1. The stewardess is greeting the passengers and showing them to their seats.
2. Passengers have to register their tickets, weigh in and register the luggage.
3. The Yeoman Warders have guarded the Tower since the reign of Henry VIII.
4. The scheduled airlines do aim their services primarily at business travellers.