My major is chemical engineering.

He is struggling to understand the perfect tense in English.

They built a deep emotional bond before they had a physical relationship.

In Marxism, it is said that the relations of production form the foundation of society.

We have maintained a good relationship for a long time.

There are many interests involved in this project.

Estrogen is a type of female hormone.

He is suspected of being a member of Al-Qaeda.

It was difficult to tell her family that she was pregnant.

It was difficult to tell the family that she had become pregnant.