In Japanese grammar, an autonomous forms the main part of the sentence.

That logic is full of fallacies.

He was hired to escort the important guest.

We are here to escort the ambassador.

The conclusion of his story was very moving.

He went to China to learn the Zhuang languages.

He should stop spouting foul language and speak more politely.

His nickname is 'Samurai'.

He can speak Estonian.

He can speak the Rade language.