Which verb tense indicates continuing action

All of the progressive tenses indicate continuing action:

Present progressive: ongoing continuous action
Past progressive tense: past continuous action
Future progressive tense: future continuous action
Future perfect progressive tense: future finished continuing action

The present progressive tense is a verb tense that means the action is continuing or in the act right now. “To be” verb is mainly used to indicate and identify this verb tense present and the applying –ing of the present participle of the verb word used in the sentence. Hence based on the given sentence above we can apply the present progressive tense as: 
For example:
The journalism staff is typing the yearbook copy, but another company is printing the book.

And also:
1. Past progressive tense
2. Future progressive tense
3. Future perfect progressive tense