In "fences" which lines are end-stopped and which are enjambed? Explain how the different types of lines emphasize meaning or affect how a reader hears and understands the poem.

The last two sections of the sonnet are made out of end-stopped lines, the rest are completely made out of enjambed lines.  

An end-stopped line is a wonderful asset that makes a refrain in a sonnet be finished on a similar line wherein it was begun. An enjambed line, then again, is something contrary to the end-halted line and is described by the breaking of a stanza, which starts in a single line, yet which is hindered by having its continuation in the following line.

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The last two verses of the poem are composed of end-stopped lines, the rest are entirely composed of enjambed lines.

Explanation:

An end-stopped line is a poetic resource that causes a verse in a poem to be completed on the same line in which it was started. An enjambed line, on the other hand, is the opposite of the end-stopped line and is characterized by the breaking of a verse, which begins in one line, but which is interrupted by having its continuation in the next line.

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.