He was affected by secondary effects.

This is a preliminary plan.

Thinking sensibly, that plan will not succeed.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.

He is thought to be a very unsociable person.

This book has up to three volumes.

He was my student, but now he has become so proficient that it can be said 'the student has surpassed his teacher.'

Each class conducts lessons in their respective classrooms.

His plan has a flaw.