He was arrested on suspicion of sitting in for someone at an exam.

He studied for at most one hour.

He is very tall.

Highways are convenient for commuting.

This building boasts the maximum height in this town.

You need to be mentally prepared before the exam.

We have a reserve fund for emergencies.

That shop is still in preparation.

He has already finished writing the report, so we use the present perfect form.

My younger sister is attending a junior college.