The elephant seal is a very large marine mammal.

We have maintained a good relationship for a long time.

There are many interests involved in this project.

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.

He is studying late into the night to learn a new computer language.

She is learning the grammar of the present progressive form.

He has already finished writing the report, so we use the present perfect form.

He miraculously survived the accident.