Reformuler chacune des phrases suivantes en utilisant les modaux need ou must à la place de have to, de façon à conserver le sens initial de chaque phrase.
It doesn't have to be so difficult.
I have to finish my homework.
She has to be back at 7 p.m.
We have to look after our little brother.
I don't have to go to work today.
You have to tell us what you heard.
He has to keep the secret.