If -- (CW) The Greek word meaning "when" indicates more of an expectation of something happening than "if" alone. This is how we use the word "when." This is not the simple "if." However, with the negative below, it is part of a special construction that is best translated as "unless" or "except."

a man -- (WW) The Greek word translated as "a man" in the singular means "anyone," "someone,"  "something," and "anything." The same forms are used both for the masculine or feminine so "anyone" works best for a person. It is not the word for "man."

abide -- The word translated as "abide" has the sense of to "stay," "stand fast," or "remain." Though often translated as "dwell", especially in the KJV, it does not mean to stay in a dwelling place.

not -- (CW) The negative used here is the Greek negative of a subjective opinion, commands, and requests. The sense is that "you don't want" or "think" something, not that it isn't done or thought. However, here it is part of a special construction, with the "when" above, that is best translated as "unless" or "except."

in-- The word translated as "in" means "in," "within," "with" (an instrument), "by" (near), "by" (means of), "during" (time),  or "among"  with a dative object as the one here. 

me, -- The "me" is in the indirect object form of the first-person pronoun, so usually "to me,""for me," and "by me." A dative object of a preposition implies no movement, but in a fixed position, events that occur at a specified time or while the action was being performed.

he -- This is from the third-person, singular form of the verb.

is -- This helping verb "is" indicates that the verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

cast -- The word translated as "cast" has a number of meanings revolving around "throw" as we do in English with both "throw" and "toss." Jesus often uses this word in the same way we use "dump" in English. In dice, it means "to throw" the dice, but with the sense of being lucky.

forth -- The word translated as "forth" means "out of a place" and "outside."

as  - The word translated as "as" has a very broad meaning, translated as "when," "where," "just as," "like," and related words.

a -- (WW) The word translated as "a" is the Greek definite article; without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

branch, - (CW) The Greek word translated as "branch" specifically can mean a "vine twig" or "cutting." This is the context here. Jesus only use it in the verses in this section of John about the vine. This is not the word used to refer, for example, the branches on fig trees.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

is -- This helping verb "is" indicates that the verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

withered; -- "Withered " is a verb that means "to become dry," "to become parched," and "to wither away." This verb is singular and passive so, "it is withered. "

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

men  -- (IW) There is nothing that can be translated as "men" in the Greek source.

gather --The Greek word translated as "gather" means "to bring together." It has many different uses, but it does not specifically mean gathering in the crops. That is why that idea is provided specifically by the phrase that follows. Jesus most often uses this word to mean bringing people together. He only uses it to mean "gather" crops a handful of times.

them, -- The word translated as "them" is the Greek word commonly translated as third-person pronouns in English. 

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

cast -- The word translated as "cast" has a number of meanings revolving around "throw" as we do in English with both "throw" and "toss." Jesus often uses this word in the same way we use "dump" in English. In dice, it means "to throw" the dice, but with the sense of being lucky.

them -- This English objective pronoun is added and not in the Greek source.   In Greek, pronoun objects are not repeated after each verb because they are implied by their first occurrence.

into -- The word translated as "into" means "into" a place, "towards" as a direction, "as much as (of measure or limit)," "in regards to" a subject,"up to" limits in time and measure, and "for" a purpose or object.

the -- The word translated as "the" is the Greek definite article; without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

fire, -- "Fire" is a noun that means "fire," "sacrificial fire," "funeral fire," and so on, but Christ only uses this word to describe the fire of a trash dump. He usually uses it with the word that is translated as "hell" but which was the name of the burning trash dump outside of Jerusalem.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

they -- This is from the third-person, singular form of the verb, but plural neuter nouns take a singular verb as a collection of things.

are  -- This helping verb "are" indicates that the verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

burned. -- The Greek term translated as "burned" means "to kindle", "to set on fire", "to burn," and "to bake pottery."