We had surmised that there wouldn't be any stores open at that time, but we just happened to find one.Habíamos conjeturado que no habría tiendas abiertas a esa hora, pero por casualidad encontramos una.
Since it had been so long since they had seen each other, Juan surmised that the man at his door must be a solicitor.Como hacía tanto tiempo que no se veían, Juan supuso que el hombre en la puerta era un representante comercial.
Since Bart had been away so long, we could only surmise that he wasn't coming back.Como Bart había estado fuera tanto tiempo, solo podíamos presumir que no volvería.
(f) significa que un sustantivo es de género femenino (p. ej. la mujer, la luna).
(F)
Duane closed the store based on the surmise that no one would come out in the storm.Duane cerró la tienda basado en la suposición de que nadie saldría en la tormenta.