He used a tie to bind two things together.

He shrugged his shoulders and said nothing.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.

Alkenes play a very important role in organic chemistry.

Tokyo is the capital of Japan.

My elder brother is a doctor.

Your existence is a great blessing to me.

Mobile phones have become indispensable in our lives.