Present progressives describe an action in progress, or something that started in the past and is still happening. It is formed with the helping "to be" verb in the present tense and the present participle of the verb.

Find out how young Thomas Edison’s curiosity got him into trouble, and how, during his teen years, he lost his hearing but gained confidence as an aspiring inventor, in this video adapted from AMERICAN EXPERIENCE: Edison.

In this video segment from Nature, witness the joy an elephant family experiences when a new baby elephant is born. This birth was a celebration within elephant society. 

A relative adverb is a word that talks about a place, time, or reason for something. Remember the three "w's": where, when, and why.
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Verb tense is used to show when an action occurs, whether it is in the past, the present, or the future.