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12.5 Logical Conclusions: Must and Must Not

Facts Logical Conclusions
Jenna’s songs are beautiful. She must practice a lot.
Her songs are soft and slow. She must not like hard rock.

1. Use must to express a logical conclusion I heard you laughing. You must be happy.
(an idea you are almost certain is true,
based on facts you know).
2. Use must not to express a negative Barbara must not eat meat. She never buys it.
conclusion.

7 Complete the logical conclusions. Use must or must not.

1. She is one of the most popular musicians around. She must perform a lot.

2. They never listen to Bob Marley. They like reggae music.

3. The music teacher is shouting. He be angry.

4. Brian is listening to music. He have any work to do.
5. Keiko’s guitar sounds great! It be an expensive one.

6. That song is on the radio all the time. The singer be rich.

7. Junko has seen Cats six times. She love musicals.

8. My brother gets bad grades in his music classes. He work very hard.

PRACTICE

8 Read the conversation. Circle the correct answers.

Professor: OK, class, this week we are looking at world music and how you can use it in your
own music. Have you all chosen a form of world music? Todd?

Todd: I’m sorry, Professor, I thought we were doing jazz this week . . .
Leo: Todd, sometimes I think you (1) must not / couldn’t listen at all!

Professor: That’s OK, Leo. We all make mistakes. Chen? How about you?
Chen: Um, I’m still trying to decide between two styles. I (2) may / must choose a Russian

folk song, or I (3) maybe / might use some type of Indian music.
Professor: Hmm, they’re very different. That (4) must not / must be a difficult choice. Either
one (5) must / could be interesting.

Chen: Indian music (6) could be / maybe difficult to work into my style of music.

Professor: (7) Maybe / Might try listening to some songs by the Beatles. You (8) may not /
could not realize it, but they combined Indian music with some of their music.

334 ModAls: PArt 1
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