The lines reinforce the idea that to disobey an unjust government is to fight injustice and to be a force against the problems that this government causes.
Explanation:
This question is about "Civil Disobedience."
In lines 88-96 Thoreau reinforces the idea that the government is a "great machine" that promotes injustices on an admirable scale and that impedes the individuality and proactivity of individuals, as a way to protect themselves from a possible revolt between them, but an individual who disobeys this and acts against the government, causing friction in that machine is capable of promoting changes, even if he has to appeal for disobedience.
The subject is apple because it is the topic and the verb is have been grown because grown is an action verb and have been is present perfect but I think you do include that as part of a verb.
