Từ câu 15–>17 
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14. Peter told Nick: "Would you like to stay for lunch?" (INVITED)
fefer to invited nich to stay for luch.
15. Tim told Martin: "You ought to see a doctor." (ADVISED)
to see a dorfon
• Tim
Apused Mankin
16. You want to invite someone to your wedding party tomorrow. (WHY)
17. You want to suggest that someone ought to take part in the speaking English club with you. (ABOUT)
18. You want to remind someone that he or she had better give the book back to the library. (FORGET))
19. You want to accept an invitation to your friend's wedding party. (PLEASED)
➜
20. My father said that I could use his car. (ALLOWED)