I found this book on my desk when I came ...

[ Passive Modals ]

I found this book on my desk when I came to class. It — (leave) by one of the students in the earlier class.

A. must have left

B. must be left

C. must have been left

D. must have be left

Select your answer:

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Which auxiliary do we use for I / YOU / WE / THEY

A. Have

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SpongeBob SquarePants _____________ (Create) by Stephen Hillenburg.

A. SpongeBob SquarePants is created by Stephen Hillenburg.
B. SpongeBob SquarePants was created by Stephen Hillenburg.
C. SpongeBob SquarePants has been created by Stephen Hillenburg.