Respuesta:
1. has been - for
2. have not seen - since
3. has known - since
4. has not seen - for
5. have not been - since
6. has had - for
7. have lived - since
8. has not had - for
Explicación:
El presente perfecto Afirmativo Se constrye de la siguiente manera:
Sujeto + Have o Has + Verbo en participio pasado + Complemento.
El presente perfecto Negativo. Se construye de la siguiente manera:
Sujeto + Have o Has + Not + Verbo en participio pasado + Complemento.
Since - Desde
For - Por
