It seems like you're working with a drag-and-drop exercise that involves the concept of grammatical structures. Based on your sentence, it appears you're looking for a structured response related to subjects and verbs. Here's how you might fill in the blanks:
"The Response area subject is a grammatical structure in which the subject performs the action named by the verb."
You can replace subject, subject, and verb with the appropriate terms in your activity. If you need specific terms or additional help, feel free to ask!