You must do something = Onu yapman senin için gerekli We haven’t got much time. We must hurry. You mustn’t do something = Onu yapmamalısın You must keep it a seccret. You mustn’t tell anybody else You needn’t do something = Onu yapman gerekmiyor istersen yapabilirsin We have got plenty of time. We needn’t hurry. Needn’t yerine don’t/doesn’t need to da kullanabiliriz. Burada dikkat edilmesi gereken nokta needn’t do’dur to kullanılmaz, oysa don’t need to do deriz to kullanırız. We don’t need to hurry. Needn’t have done Havada bulut var. Yağmur yağacak gibi ve dışarı çıkarken şemsiye alıyorum. Daha sonra güneş çıkıyor ve yağmur yağmıyor. I needn’t have brought the umbrella. = Şemsiyeyi aldım ama almam gerekmiyordu. Needn’t do ve needn’t have done’ı karşılaştıracak olursak. Everything will be OK. You needn’t worry. = gerekli değil Everything was OK. You needn’t have worried. = Endişelendim ancak bu gerekli değildi Didn’t need to ve needn’t have done I didn’t need to = it was not necessary for me to I didn’t need to get up early, so I didn’t. I didn’t need to get up early, but it was a lovely morning, so I did. I needn’t have done something = I did it, but now I know that it was not necessary I got up very early because I had to get ready to go away. But in fact it didn’t take me long to get ready. So, I needn’t have got up so early. I could have stayed in bed longer.