Underline the subject of each sentence. Draw a line through any phrase that separates the subject from the verb. Finally, underline the verb that agrees with the subject

Your question is incomplete as it does not contain any sentences to be analyzed. However, based on the requirements, here's a quick definition of the technical terminology that will be used for the

Subject: doer of an action'any phrase': this is usually referred to as 'prepositional phrase' and most of the errors related to Concord (subject-verb agreement) are due to these phrases.

For instance, consider the following sentences:

a. This photo of all of my family members (is/are) quite nostalgic.

The correct verb is "is" - not "are".

b. The orchards in my city, which is also known as the city of lights, (is/are) quite mesmerizing.

The correct verb is "are" - not "is".

"decapitation of the government" is the idiom Jay Winik used in the second paragraph. The idiom's intended meaning is the severance of the top government officials from the remainder of civil society through assassination. I think the idiom was chosen to add a grave visual description of the sense of the moment.