[ Perfect Modals ]
Patty ____________been at the mall last night. She was out of town visiting her mother.
A. couldn’t have
B. must have
C. mustn’t have
D. could have

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Modal Verbs › ViewThey ____ be late if they don’t leave soon.
A. could
B. will
C. may
Vocabulary and Grammar › View
If you _______ an unhealthy lifestyle, you may not have much energy.
A. have
B. be
C. have