Did you return Fred’s call?—I didn’t need to because I’ll see him tomorrow.问下为什么这样可以,need to 后面的宾语呢?

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• Did you return Fred’s call?—I didn’t need to because I’ll see him tomorrow.
• Did you return Fred’s call?—I didn’t need to because I’ll see him tomorrow.问下为什么这样可以,need to 后面的宾语呢?
• _____the exercise-books_____(must return)to the students tomorrow?请分析完整正确。be returned，为什么用这个？
• 译Professor Smith is always very sensitive to the reaction of the audience when he gives lectures.