Dictionary form - oneself vs. yourself

dictionaries

Solution 1:

The children enjoyed themselves/He enjoyed himself/She enjoyed herself.

As the reflexive pronoun has various forms, most dictionaries give the infinitive in the form "to enjoy oneself". This is the usual way. "to enjoy yourself" is not correct as "yourself" refers to "you" and the dictionary form "to enjoy" has no personal pronoun to refer to.

The reflexive pronoun to it is itself. The cat lay on the sofa, washing itself.

The reflexive pronoun to one (general personal pronoun) is oneself, formal. Longman DCE: It is only through study that one really begins to know oneself.

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