The placenta is an important organ that connects the mother and the fetus.

Having a face-to-face conversation with him always evokes a fresh feeling.

Today's match will be a confrontation between the two aces.

In today's match, he and I will face off.

The game against him was very difficult.

I played a game of Go with him.

Nouns form the main part of the sentence.

He made a sentence using the accusative case.

The opposite angles of a quadrangle intersect each other.

The continental shelf plays an important role as a habitat for marine life.