Hello queenbu it appears that you have not posted on our forums in several weeks, why not take a few moments to ask a question, help provide a solution or just engage in a conversation with another member in any one of our forums?
Hello everyone!I've had computer problems!Glad to be back.
In an exercise you have to complete the sentences with must or can't.
She.............be on a diet. She's very slim.
I guess it should be 'can't' in this exercise but doesn't 'must' (with the emphasis on 'must') also fit in well?
Hello Queenbu, welcome back! I'm sorry about your pc problems. I've had them too...
1. She must be on a diet. She's very slim.
-- i.e. "I have to conclude that she is on a diet, because she's very slim."
2. She can't be on a diet. She's very slim.
-- i.e. "I don't believe she's on a diet, because she's very slim."
#1 is in accord with a melancholy truth: "some people are slim because they're on a diet".
#2 however would depend on a melancholy untruth: "people who are slim don't need to go on diets".
So I would only choose #1; #2 seems to be a non sequitur!