Need I help you? — No, thank you, I shall do everything myself.
You need not go there.
He need not worry about her.
I need not ask him: he will tell me everything himself.
You need not ring me up: I won’t forget about my promise.
Need she buy so many groceries?
She need not go to the library: I shall give her the book.
You need not have taken the umbrella: I am sure it won’t rain.
We have got plenty of time to spare, and we needn’t hurry.
You needn’t do it now. You can do it tomorrow.
She needn’t help. Everything has been already done.
He needn’t have sold his piano.
You needn’t have shouted at the child like that.
Now they can’t sleep. — They needn’t have watched this horror film.