Modals
Kip ve Kesinlik Dönüşümleri
It is likely that … = … will probably … = There is a good chance that … It is unlikely that … = … probably won't … It is necessary to … = must / have to. It is not necessary to … = needn't / don't have to. It is possible that he left = He may / might have left. I'm sure he left = He must have left.
YDS Tuzağı: 'mustn't' yasak bildirir, 'don't have to' gereksizlik bildirir; ikisi birbirinin yerine kullanılamaz.