E. We use a reflexive pronoun after a transitive verb when the direct object is the same as the subject of the verb. (e.g. I am teaching myself to play the piano.)
a. These are the verbs most often found with reflexive pronouns: cut, dry, enjoy, hurt, introduce, kill, prepare, teach
b. Some verbs change their meaning slightly when they have a reflexive pronoun as direct object: amuse, apply, busy, content, behave, blame, distance, express, find, help, see (e.g. Would you like to help yourself to another drink? = Would you like to take another drink?)
E1. The verb ‘enjoy‘ always has an object. (e.g. We all enjoyed the party.)
a. If ‘enjoy’ has no other object, we use a reflexive pronoun. (e.g. They all enjoyed. They all enjoyed themselves.) But We do not use a reflexive pronoun after verbs which describe things people usually do for themselves. (e.g. He washed in cold water.)
b. We only use reflexives with these verbs for emphasis. (e.g. He dressed himself in spite of his injuries.)