Поставьте предложения в вопросительную и отрицательную формы. 1.Our engineer will be busy tomorrow. 2.The classes are over at 4 o'clock. 3.Your friend is fond of music. 4.They were absent yesterday.

В первом случае просто ставишь глагол на первое место 1. Will our engineer be busy tomorrow? 2. Are the classes over at 4 o'clock? 3. Is your friend fond of music? 4. Were they absent yesterday? А во втором добавляешь к глаголу частичку not 1. Our engineer won't be busy tomorrow 2. The classes aren't over at 4 o'clock 3. Your friend isn't fond music 4. They weren't absent yesterday