Commissive: cam kết, hứa hẹn
Directive: hướng dẫn
Expressive: biểu thị thái độ
Representative: cung cấp thông tin
Rogative: hỏi thông tin
Why don't you talk to him?
Mary: Why don't you talk to him?
Jane: Because I don't dare to.
==> Mary directly asks Jane for a piece of information. This is a rogative.
Mary: I want to ask our boss for a few days off.
Jane: Why don't you talk to him?
==> Jane indirectly gives Mary a piece of advice. This is a directive.