Разница между глаголами say, tell, speak, talk

smb – tell me
tell smth – tell a story
tell smb to do smth - указание сделать что-л – I told him to be quiet.

to speak to you.
speak of / about smth – I can speak with my psychologist about my feelings.
speak languages – I can speak 3 l-s.
speak (how?) quietly, loudly, happily – Speak quietly, please.
speak (in Pr. Cont) – on the phone – Shhh, Sue is speaking.