He is interested in the study of international auxiliary languages.

I have been to Santo Domingo.

He is an expert in sociolinguistics.

I am very interested in sociolinguistics.

Trinidad and Tobago is a country located in the Caribbean Sea.

He always boasts, but in reality, he does nothing.

He has a habit of always boasting.

This lime sulphur is very effective in preventing pests and diseases in fruit trees.

The era of the Three Sovereigns and Five Emperors is an important period in Chinese history.

My friend came from Congo-Brazzaville.