Identify the form of the verb.
D. Progressive.
The sentence presents a verb in the <u>progressive form</u>, which is an action that is taking place in the present and is formed by the basic form of the verb "work" plus "ing": <em>working</em><em>. </em>
The sentence with a <u>basic form</u> of the verb would be:
- I <em>work</em> on my homework for hours.
The sentence with a <u>emphatic form</u> ("do" plus present or past form of the verb):
- I <em>do work</em> on my homework for hours.
"Work" is a regular verb, thereby, it cannot be used as an irregular one. It can be changed thus:
- I <em>have written</em> on my notebook for hours.
