Answer:
1. La grabadora; las grabadoras.
2. Unos profesores; un profesor.
3. Unas escuelas; una escuela.
4. El autobús; los autobuses.
5. Unos estudiantes; un estudiante
6. Unos lápices; un lápiz.
7. El problema; los problemas.
8. Los pasajeros; el pasajero.
Explanation:
when we speak in the singular we mean only one person, animal or thing and when we speak in the plural we refer to several of these. therefore, identifying the narrator and the time that a sentence indicates is the first step that must be taken. this is very important to be able to logically conjugate the verbs, and that these have concordance with what is being expressed
