Subject and object pronouns

WHAT ARE SUBJECT AND OBJECT PRONOUNS?
Subject and object pronouns are very important to communicate in English.
Pronouns replace nouns. Take a look at these examples:
- Sara likes pizza.
- She likes pizza.
In the second sentence, "she" is the same as "Sara".
Subject and object pronouns replace nouns that are either subjects or objects.

SUBJECTS AND SUBJECT PRONOUNS
Subjects go at the start of the sentence. They do the action:
Dave plays baseball.
Subject pronouns replace subjects, so they are normally at the start of the sentence:
He plays baseball.

OBJECTS AND OBJECT PRONOUNS
Objects go at the end of the sentence. They receive the action.
Dave has a bicycle.
Object pronouns replace objects, so they are normally at the end of the sentence:
Dave has it.
Fuente: http://www.learnenglish-online.com/grammar/subjectobjectpronouns.html

Fuente: http://www.slideshare.net/jbsaenz/subject-and-object-pronouns-12550489

Ejercicios para practicar:
- Subject pronouns
- Subject and Object pronouns (1)
- Subject and Object pronouns (2)
Fuente: http://www.learnenglish-online.com/index.html

Y, por último, aquí tenéis un vídeo para repasar (con ejemplos) y practicar la pronunciación: