has walked, a regular, intransitive verb, indicative mood, perfect tense, 3rd person singular to agree with its nominative or subject he.

with, a preposition, governing the noun difficulty.

much, an adjective, positive degree, qualifying the noun difficulty.

difficulty, a common noun, 3rd person singular, neuter gender, objective case governed by the preposition with.

N.B.—Much is generally an adverb. As an adjective it is thus compared:

PositiveComparativeSuperlative
muchmoremost

CHAPTER III

THE SENTENCE

Different Kinds—Arrangement of Words—Paragraph

A sentence is an assemblage of words so arranged as to convey a determinate sense or meaning, in other words, to express a complete thought or idea. No matter how short, it must contain one finite verb and a subject or agent to direct the action of the verb.