The development of nuclear-powered ships must consider their impact on the environment.

Freedom of speech is a fundamental element of democracy.

The study of filterable pathogens is an important part of virology.

His work skillfully incorporates elements of modern parody.

She was diagnosed with collagenosis.

We need to find a fundamental solution to this problem.

I am learning how to use the present participle in English.

The present tense is used to express things that are happening now or general facts.

She damaged her speech center due to a stroke and lost the ability to speak.

Do you know the origin of this word?