I'm troubled by his unproductive attitude.

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.

He was immersed in music.

My father is spreading phosphate fertiliser in the field.

I met him for the first time in a long time.