Speak nói ngôn ngữ
e.g. speak English, nói chuyện speak to/with someone about something = talk to/with someone about something, đặc ngữ: speak ill of (nói xấu ai), speak well of (nói tốt ai)
Say dùng trong câu gián tiếp, trực tiếp e.g. say that…, say something to someone, say goodbye, say hello, say “cheese”
Talk nói chuyện = speak, đặc ngữ talk big (khoác lác), talk dirty (nói tục)
Tell nói, kể, bảo tell someone something/ about something/ to do something, tell someone that…., đặc ngữ tell the time, tell the truth, tell a story, tell a joke