Question

what is the difference between emphatic pronoun and reflexive pronoun

Answer 1

The pronouns myself, yourself, himself, herself, itself, ourselves and themselves are Reflexive/Emphatic Pronouns. They are used as objects of the verb when the action of the verb returns to the doer. The subject and object of the sentence are the same person. They are used to emphasise a noun or pronoun.

The difference between the two constructs is whether it is necessary for the specific meaning (then it's reflexive) of the sentence or can be omitted without changing the actual meaning (then it's emphatic).

In your particular sentence:

I did it myself.
if you omit "myself", then the meaning (that "it" was "done" by you) still remains:

I did it.
So, the pronoun is emphatic.

A few examples:

He knocked himself out. -- reflexive.
He himself called the police. -- emphatic
They don't consider themselves brave. -- reflexive
They climbed the mountain all by themselves. -- reflexive
They climbed the mountain themselves. -- emphatic

Answer 2

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