We usually find in grammars a classification of pronouns into personal, possessive, interrogative, indefinite, relative, etc. It is clear, however, that some points in that classification are not grammatical at all. Thus, if we say, for example, that a pronoun is indefinite we do not characterise it from a grammatical but from a semantic point of view. There is no doubt that the pronoun something is indefinite in its meaning, but that indefiniteness of meaning is in no way reflected either in its morphological properties or in its syntactical functions. This is as much as to say that the indefiniteness of its meaning is irrelevant from the grammatical viewpoint. In a similar way, if we state that the pronoun nothing is negative, we characterise its meaning (and a most important characteristic it is, too), but, again, this is irrelevant for grammar, since it does not entail anything concerning the morphological or syntactical peculiarities of the word. Therefore, in proceeding to a study of pronouns, we will try to keep the grammatical viewpoint firmly in mind, though this will not always be an easy thing to do.