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"Professor Smith is a classical economist, specializing in theories of supply and demand. "

"During class today the professor delivered an interesting lecture."

"The constant noise from the construction site made it hard to concentrate on my homework. "

"The student listened attentively to the teacher's instructions. "

"The reversion of the old house to its original owners after the tenant broke the lease was a complicated legal process. "

"We need some sort of principles to reason from."

"Professor Smith, the head of the history department, gave a fascinating lecture on the Roman Empire. "

"We are discussing the homework assignment in class. "

"Her childhood memories of playing hide-and-seek with her siblings were happy and vivid. "

"Scientists develop theories to explain how the universe works. "

"The doctor prescribed a physics to help her patient with indigestion. "

"The verbs in sentences like "Do it!" and "Say what you like!" are in the imperative."