missing "in"  -- (MW) The untranslated word "in" is used again before the "this night," but isn't translated in this KJV.

This -- The "this" is a pronoun that can mean "this" or "that," the nearer or the further depending on usage.

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

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

night:  - -- "Night"  is the noun that means "night," "midnight," and is a metaphor for darkness. --

you - (MW) The pronoun "you" is used explicitly as the subject of the sentence. Since it is already part of the verb, its use here creates emphasis on the "you" as we say "your yourselves." Without the "yourselves," this emphasis is lost.

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

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

all  -  - The word translated as "all" is from the Greek adjective meaning "all", "the whole", "every," and similar ideas. When it is used as a noun, we would say "everything." As an adverb, it means "in every way", "on every side," and "altogether."

fall away- - (WW, WV) The keyword here, translated as "fall away" is a "Greek" word that is found only in the Bible. It refers to putting a stumbling block before someone to trip them up and thereby offending them. In English, we would simply say, "trips you up." Though it doesn't sound like it in English translation, Christ uses this word to make light of his effect on the thinking of others. It is plural, future, passive. This verb is active, not passive.

on account of -  (WW) The word translated as "because of" means "in", "on", "by". "within", "with," or "among." Here it means "on."  It doesn't really mean "on account of", that is, offering a cause, which is a different, common word in Greek. This word works because people trip "on" things.

me -- "Me" is from the regular first-person pronoun in Greek.

for  --The word translated as "for" introduces a reason or explanation so "because" and, in questions, "why." However, since this word always appears in the second position, it is more like an aside remark like, "consequently" or "as a cause." 

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

is -- (WT) This helping verb "is" indicates that the following verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English. However, the tense here is the past perfect, so "has been."

written -- "Written" is a verb that means "to mark," "to express by written characters," and "to write down [a law]."  The verb is passive, completed in the past, "it has been written."

I -- This is from the first-person, singular form of the verb.

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

strike - - The "strike " is translated from a Greek word that "to beat", "to knock", "to strike," "smite", "slaughter", and "to afflict." In the OT quote, it is a command but the command is given by the Lord to his sword.

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. 

shepherd,  - The word "shepherd" is the standard word that Jesus uses for a shepherd.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also").

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. 

sheep  - - The word for "sheep" is a word that applies to any domesticated herd animal, which is probably why Christ adds the word translated adds "of the flock" because the word translated as "flock" specifically refers to sheep.

of -- This word "of"  comes from the genitive case of the following word that requires the addition of a preposition in English. 

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. 

flock  -  The word translated as "flock" is from the same root as "shepherd" and "sheep" so it is more like our word "sheepfold."

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

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

scattered  - The word used for "scatter" also means "to scatter among", "to disperse among" and "to winnow," which is separating the wheat from the straw.