need

Used mainly in negatives to say that something is not necessary.

• You need not worry about it.
  Bunun için endişelenmene gerek yok.
• You needn't come if you're busy.
  Meşgulsen gelmene gerek yok.

Used in questions, in formal English, to ask if something is necessary.

• Need I remind you that the exam is tomorrow?
  Sınavın yarın olduğunu hatırlatmama gerek var mı?
• Need I bring anything to the party?
  Partiye bir şey getirmeme gerek var mı?

Used in the form needn't have done for something that was done but was not necessary.

• You needn't have brought a present.
  Hediye getirmene gerek yoktu.
• We needn't have hurried; the train was late.
  Acele etmemize gerek yokmuş; tren gecikmiş.