If Yo escribo en mi cuaderno is in the present tense then which one of these progressive tense?

The progressive tense of "Yo escribo en mi cuaderno" (I write in my notebook) is:

Yo estoy escribiendo en mi cuaderno.

This translates to "I am writing in my notebook."

Here's how it works:

* Yo: This is the subject pronoun (I).

* estoy: This is the present tense of the verb "estar" (to be), which we use to form the progressive tense in Spanish.

* escribiendo: This is the present participle of the verb "escribir" (to write).

* en mi cuaderno: This is the prepositional phrase indicating where the action is taking place (in my notebook).