with the preposition by when we mean alone/ without company or without help(on one's own). She spent her weekend by herselfon her own.
in the following expressions: enjoy yourself(have a good time). yourself(be good), help yourself(you ar etcome to take something if you want). Help yourself to some food.
to emphasise the subject or the object of a sentence. wrote this essay myself. (I wrote this essay. Nobody else wrote it.) Bob met Hillary Swank herself. (Bob met Hillary Swank, not somebody else.) NOTE: 1 We do not normally use reflexive pronouns with the verbs concentrate, feel, meet and relax. You need to relax(NOT: tortneed-te retex-yordrsety.) 2 Reflexive pronouns are used with the verbs dress, wash and shave when we want to show that someone did something with a lot of effort. Although she is only three yeors old, she manages to dress herself