D. A Reflexive Pronoun is to denote a pronoun that refers back to the subject of the clause in which it is used.
a. Singular Reflexive Pronouns (myself, yourself, himself/ herself/ itself) and Plural (ourselves, yourselves, themselves)
b. use the Reflexive Pronoun as a direct object when the object is the same as the subject of the verb (e.g. I am teaching myself to play the piano.)
c. can use the Reflexive Pronoun as a direct object with most common transitive verbs. (e.g. amuse, blame, cut, dry, enjoy, help, hurt, introduce, kill, prepare, satisfy, teach, etc.)
d. can use the Reflexive Pronoun when the indirect object is the same as the subject of the verb. (e.g. Would you like to pour yourself a drink.)
e. as the object of a preposition when the object refers to the subject of the clause. (e.g. They had to cook for themselves.)
f. with the preposition 'by' when we want to show that someone did something alone and/or without any help. (e.g. He lived by himself in an enormous house.)
g. to emphasise the person or thing we are referring to (e.g. Worcester Park itself is quite a small town.)
h. can also use own to say that you do something yourself instead of somebody else doing it for you. (e.g. I repaired it myself = I repaired it, not anybody else. Here myself is used to emphasise 'I' (= it makes it stronger))
i. especially if we are talking about someone very famous (e.g. Sir Paul McCartney himself sang the final song.)
j. often put the Reflexive Pronoun at the end of the clause when we are using it for emphasis (e.g. I baked the bread myself.)
k. Some verbs change their meaning slightly when they have the Reflexive Pronoun as direct object. (e.g. Would you like to help yourself to another drink? = Would you like to take another drink.)
l. do not use the Reflexive Pronoun after verbs which describe things people (e.g. feel, relax, concentrate, meet, etc. I feel nervous. I can't relax), and usually do for themselves (e.g. wash, shave, dress, etc. He got up, washed, shaved and dressed. (not washed himself etc.)) Only use reflexives with these verbs for emphasis (e.g. He dressed himself in spite of his injuries.)
Reflexive Pronoun: ~ of mine
D1. say '(a friend) of mine/ yours/ his/ hers/ ours/ theirs'. (e.g. I'm going to a wedding on Saturday. A friend of mine is getting married.)
a. In the same way we say '(a friend) of my sister's/ (a friend) of John's'. (e.g. That woman over there is a friend of my sister's)
b. use my/ your/ his/ her/ its/ our/ their before own. (e.g. my own house)
c. My own ~/ your own ~ etc. = something that is only mine/ yours, not shared or borrowed.
d. by myself and on my own both mean 'alone' (e.g. I like living on my own/ by myself)