| some- | somebody / someone / something / somewhere | oraciones afirmativas, ofrecimientos y peticiones | I saw somebody in the garden. |
| any- | anybody / anyone / anything / anywhere | después de not y en preguntas | I didn't see anybody. / Did anyone call? |
| no- | nobody / no one / nothing / nowhere | el verbo es afirmativo: una sola palabra negativa | I saw nothing. |
| every- | everybody / everyone / everything / everywhere | significa «todos, todo» | Everything is ready. |
| Verbo | everybody | los pronombres indefinidos llevan el verbo en singular | Everybody is here. |
| Trampa | nobody | sujeto negativo → nobody | Nobody came. |