FUTURO: need not [A.H.]; shan’t/won’t need to // shan’t/won’t have to [A.E.]
PRESENTE: need not [A.H.]; don’t/doesn’t need to // don’t/doesn’t have to // haven’t/hasn’t got to [A.E.]
PASADO: didn’t need to // didn’t have to // hadn’t got to [A.H./A.E.]
shan’t/won’t need to = shan’t/won’t have to
don’t/doesn’t need to = dont/doesn’t have to
didn’t need to = didn’t have to (pero «didn’t have to» es la forma más usual)
No hay equivalentes «need» exactos de haven’t/hasn’t got to y hadn’t got to.
A Practical English Grammar (A.J. Thomson & A.V. Martinet) 