He has expert knowledge.

We need to make a strategic plan.

Writing a declaration is difficult.

He found forensic evidence.

A drop of water fell from the cup.

He is an expert in ethology, and his research is highly regarded worldwide.

We often have picnics by the river on weekends.

I like to drink coffee that I roast myself every morning.

His country had been suffering from a long civil war.

He said he met a mountain fairy in the mountains.