unit 1 starting a conversation, introduction and greeting
unit 2 congratulations and thanks
unit 3 apology, regret and forgiving, blaming and complaining
unit 4 permission - seeking and leave - taking
unit 5 intentions, promising, reminding and remembering
unit 6 request, offer, acceptance and refusal
unit 7 obligation, instruction, command and warning
unit 8 persuading, giving advice and expressing enthusiasm
unit 9 determination, decision and insistence
unit 10 suggestion, objection or negation
unit 11 likes, dislikes and preferences
unit 12 possibility and im