Nice song and nice lyrics
Grete reacts at first by trying to help him. Like she gives him milk because she knew he used to like it. Soon enough though she begins to tire of her role and just brings Gregor the tray of food or throwing the food in. Towards the end of the story, she insists that Gregor is a monster and that he needs to leave or something needs to change.
When looking at what the subject does in a sentence, you are looking at the action. A sentence consists of two basic parts: who/what is doing what. The cat (who/what) chased the mouse (did what). The subject is the who/what part of the sentence, and the verb is the action of the sentence. Consider the following sentence: He ran quickly. A pronoun is a word that renames the noun ("he" rather than "Jim" or some other proper name). And an adverb modifies a verb ("quickly" modifies "ran").
