He falsified the fact to hide his mistake.

His mistake of fact caused a big problem.

His claim does not match the actual relationship.

He denied the fact of the crime.

He troubled us by creating a fait accompli.

We are in a common-law marriage.

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

Natural language understanding is an important field of artificial intelligence.

He likes to take a walk in the park at dusk.

We should always remember the power of Kannon in difficult times.