- This is a story about a rabbit named Rabbit and a frog named Frog. Rabbit and Frog
are good friends, but Rabbit's family doesn't like Frog, and Frog's family doesn't like
Rabbit.
Rabbit's family says, "You shouldn't be friends with Frog. He's too different from
us. He's green and has big eyes. He looks strange. You should stay with your own
kind."
And Frog's family says, "How can you be friends with Rabbit? He's big and
clumsy. He's covered with hair and has funny ears. Don't bring Rabbit to our house.
What will the neighbors think?"
-11 MAKlNti LUtilLAL LUNLLUSIUNS: MUSX.
(a) A: Nancy is yawning.
B: She must be sleepy.In (a): Speaker B is making a logical guess. He
bases his guess on the information that Nancy is
yawning. His logical condusion, his "best guess," is
that Nancy is sleepy. He uses must to express his
logical conclusion.
(b) LOGICAL CONCLUSION: Amy plays tennis every
day. She must like to play tennis.
(c) NECEssIrY: If you want to get into the movie
theater, you must buy a ticket.
(d) NEGATIVE LOGICAL CONCLUSION: Eric ate
everything on his plate except the pickle. He
must not like pickles.
(4 PROHIBITION: There are sharks in the ocean near
our hotel. We must not go swimming there.I COMPARE: Must can exprese
1 a logical conclusion, as in (b).
necessity, as in (c).COMPARE: Must not can express
a negative logical conclusion, as in (d).
prohibition, as in (e).210 CHAPTER 7