missing "behold"  -- (MW) The untranslated word "behold" is from an adverb meaning "Lo! Behold!" and "See there!"

We -- This is from the first-person, plural form of the verb.

are -- This helping verb indicates the present tense of the verb. It is used here to form the present, progressive tense, which doesn't exist in Greek but which can smooth the flow of English sentences.

going up -- (WF) "Going up" is from a verb which means "go up", "shoot up," and "ascend." It is also a word that means "ascending to higher knowledge." This is not a progressive form but an active verb, "go." WF -- Wrong Form -   This is not a progressive form but an active verb, "go."

 to  -- The word translated as "to" means "into" a place, "towards" as a direction, "in" (a position),  "as much as (of measure or limit)," "in regards to" a subject, "up to" limits in measures, "until" in reference to time, "within" a time limit, and "for" a purpose or object. Used with the Greek "from" it means "from...to."

Jerusalem, -- The word "Jerusalem" denotes the city or its inhabitants. Two different forms of this word appear in the NT. It is only used once in Mark, but not in Jesus's words. It isn't used at all in John. It appears three times in  Jesus's words in Matthew. This version is used most heavily in Luke, mostly in his narration, but a few times in Jesus's words. It seems to be the more formally Greek version of the name.

and -- The Greek word translated as "and" is used as the conjunction "and", but in a series, as it appears here, it is best translated as "not only...but also."

everything -- The word translated as "everything " is the Greek adjective meaning "all", "the whole", "every," and similar ideas. The form is plural neutral, which is what the "things" comes from. 

that  -- (CW)The word translated as "that" is the Greek definite article, "the," which usually precedes a noun or changes the word it precedes (adjective, infinitive, participle, etc.) to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more.  This word doesn't mean "come" in this situation..

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

written -- (WF)"Written " is the Greek verb that  means "to mark", "to express by written characters", "to write a letter", "to write down [a law]", and so on. It has the same root as the "letter" above.  It is in the form of an adjective of something completed itself in the past.  However, it is in the middle voice so it isn't passive but something being acted on by itself, "having  written themselves" or, more precisely, "having been written by themselves". Jesus often talks about the OT as something that created itself through men. This is not an active verb but a participle, a verbal adjective, "the ones having been written." 

by -- The word translated as "by" means "through," in the midst of," or "by (a cause)." The "through" works best because the laws wrote themselves. People were a method.

the   -- The word translated as "the" is the Greek definite article, "the," which usually precedes a noun or changes the word it precedes (adjective, infinitive, participle, etc.) to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

prophets -- (UW) The Greek word translated as "prophets" means "one who speaks for God," "interpreter" and was the highest level of priesthood in Egypt, but its root words mean "shine light before" and so "luminaries," "shining lights" or "enlightened" seems to capture the idea better. Jesus uses it to refer not only to divine spokespeople but their books in the OT.   It is an untranslated Greek word adopted into English. It means "one who speaks for God", "interpreter" and was the highest level of priesthood in Egypt. It does not mean "one who sees the future" as it does in English. The sense is more a "luminary" because the Greek word comes from "light shining." Read this article for more information. 

about  -- This word "about" comes from the indirect object form of the following word that requires the addition of a preposition in English. The most common is a "to" for the English indirect object. However, the translator can choose other prepositions: "with,"  "in,"   "of,"  "as," "by," "for," "at," or "on" depending on the context. "about" words as a way of say "of" and "on."

the -- The word translated as "the" is the Greek definite article. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

Son -- The word translated as "son" more generally means "child" or "descendant." The phrase "the son of man" is the common way Christ refers to himself. It is discussed in detail in this article. Its sense may be "the child of the man."

of -- This word "of"  comes from the genitive case of the following word that required the addition of a preposition in English.  The most common is the "of" of possession, but it can also mean "belonging to," "part of," "which is," "than" (in comparisons), or  "for," "concerning" or "about" with transitive verbs. 

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. 

man - The Greek word for "man" means "man," "person" and "humanity" in the singular. In the plural, it means "men," "people," and "peoples." 

will -- This helping verb "will " indicates the verb is in 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 

 fulfilled. -- "Fulfilled" is translated from a Greek word, which means "to complete" and "to accomplish," especially in the sense of having goal.  It also means "to bring to perfection." The form is the third-person, passive, past perfect, so "it has been accomplished."