Answers:
1. Can’t be
2. Can’t have won
3. Must have been
4. Must be
5. Couldn’t have been
6. May have been
7. Ought to have left
8. Can’t be
9. Could turn out
10. Must have left
11. Should have won
12. Should be
The subject of a clause goes in one slot, the verb in another, and so on. Words that modify another word are attached to the word they modify.
Explanation:
Without question, you should avoid sentence fragments in formal situations and academic writing. That said, a fragment within a clear context can sometimes serve a valid dramatic purpose. Journalists, bloggers, and fiction writers often use them.