We participate in this ritual every year.

The priest was offering prayers in the church.

This bottle is reusable.

He utilized his project management skills to start a new business.

He is struggling to understand the perfect tense in English.

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

She is struggling to understand the perfect tense in English.

Let's advance our project using this cutting-edge technology.

The problem of finding the least common multiple is one of the basic problems in mathematics.

Finally, he completed the project.