Present participle

The present participle is a fancy name for "-ing" verbs forms.  And it is constructed like so:

"to be" (conjugated) + infinitive (without 'to') + -ing

  I am + sing +ing =  "I am singing."

This participle is found in the following tenses:

- the future progressive (I will be studying tomorrow.)

- the future perfect  progressive (I will have been studying 5 hours by the time we eat lunch.)

- the present progressive (I am studying.)

- the present perfect progressive (I have been studying.)

- the past progressive (I was studying.)

- the past perfect progressive (I had been studying maths before she entered the room.)

The present participle also can be used as an adjective, i.e. "My mother is a working woman."

NOTE:  The "-ing" form used to form nouns is not called the present participle, but the gerund. An example of the gerund as a noun is, "Running is great exercise."