Reflexive pronouns are used as objects in a sentence when we have the same noun as the subject and the object. They can be either direct or indirect objects. Examples: Rachel saw Rachel in the mirror and was happy with the outfit. (absurd)Rachel saw her in the mirror and was happy with the outfit. (this sentence means that Rachel saw some other person in the mirror.)Rachel saw herself in the mirror and was happy with the outfit. (this is the correct sentence which implies Rachel is both the subject and object. The verb ‘saw’ is done by Rachel and also experienced by Rachel.) Sam cut Sam with a knife. (absurd)Sam cut him with a knife. (this sentence means that Sam has cut some other person.)Sam cut himself with a knife. (this is the correct sentence which implies am is both the subject and object. The verb ‘cut’ is done by Rachel and also experienced by Sam.)
Reflexive pronoun ONESELF At times, we make a general statement or state moral duties. These sentences are meant for everyone. So, in this case we use subject ‘one’ to start the sentence. In this case we can use only reflexive pronoun ‘oneself’ and no other reflexive pronoun!Examples: One cannot lie to himself. (INCORRECT)One cannot lie to oneself. (CORRECT)One should respect not only others, but also themselves. (INCORRECT)One should respect not only others, but also oneself. (CORRECT)