Participle: <span>is a form of a verb that is used in a sentence to modify a noun, noun phrase, verb, or verb phrase, and then plays a role similar to an adjective or adverb. It is one of the types of nonfinite verb forms.
Verb: </span><span>a word used to describe an action, state, or occurrence, and forming the main part of the predicate of a sentence, such as </span>hear<span>, </span>become<span>, </span>happen<span>.</span>
I think itis the last one
The underlying meaning of this poem is that people tend to regret decisions and choices, no matter how small. Frost shows that by writing "yet knowing how way leads on to way, I doubted if I should ever come back." This could be interpreted by the reader as Frost unsure, and doubtful of his decision, still to be made, even though he feels it has already been chosen. He regrets that he choses the path that is easy, and fails to realize the easy path is not always the right path. (sorry if this doesn't help) :)
To presume something in advance
