The image of "a huge mountain 'tween my heart and tongue" suggests that Portia does not want to say what she is feeling.
When Lucius asks Portia why she sends him to the Senate, she hesitates to answer him; her mind is put elsewhere. Portia wants to be strong enough not to reveal what she knows about Brutus' plans, since he considers Caesar has to be killed for power abuse. She cannot keep such secret anymore, and begs "constancy" to help her maintain composure.
Naturalism vs. Romanticism
Similarities
‣ Share a respect and interest for nature.
Differences
‣ Naturalism values science and romanticism values spirituality.
‣ Romanticism focuses on inspiration from nature, individualism, emotions, and transcendence.
‣ Naturalism focuses on scientific laws and theories.
- Paragraph 5, John Muir's "The Calypso Borealis"
In this paragraph Muir is talking about how all his negative feelings had disappeared after finding the Calypso. The calypso had uplifted his mood and he was no longer worrying. He also introduces a new dialect in this paragraph when he talks about meeting the locals of the swamp. In this paragraph you can see how much Muir really appreciates and enjoys being in nature because the locals couldn't believe that he had come out to the swamp in search of plants. He uses words such as "strong and exhilarated" to describe how the Calypso made him feel.
You did not include the other part of the question but with some googling i think this answer is what you were looking for:
"to the grocery store" modifies drive. Because drive is a verb, that makes "to the grocery store" an adverb phrase.
C. do i have clear focus followed by relevant and intresting supporting details
Hope this helps