Answer:
We do our homework is the principal part because it includes the subject, and verb.
Step-by-step explanation:
All right in this composed sentence, we can observe something pretty clear. It starts with the subject and it is followed by the verb, then it goes on with a possessive adjective. Followed by an object involved in the action. Therefore we complement it with the location in which we carry on the action. This is a specification of what we are doing here, therefore because we only provide further detail to amplify the reach of knowledge and data of the action it is the second part.