missing "the/this"-- (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. 

Heaven - (CW, ) The word translated as "heaven" means simply the "sky," but it can also mean the "climate," or the "universe." It also meant the home of the gods in a physical sense: the sun, moon, and planets were named for the gods. More about the word in this article. CW --Confusing Word --The word, "heaven," is a religious concept, but this word just means "sky."

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 best translated as "not only...but also." After words implying sameness "as".

missing "the/this"-- (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. 

earth -- The word translated as "earth" means the physical planet, not society, which Christ describes as the world. See this article for more on these words.

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

dissappear, -- (WW) The "disappear" is from a verb that means  means one thing going by another, one thing surpassing by another,  or the "passing" the time. It also has the sense of arriving to a place and to "pass" a test. It does not mean "pass away" as in dying. The form indicates something acting on themselves. This is different than the form in the previous verse and later in this verse.

missing "themselves" -- (MW)  The middle voice of the verb indicates that the subject does something to, for, or by themselves. MW -- Missing Word -- This verb is a middle voice, which requires a "by/for themselves" or a "themselves" as an object.

but -- The Greek word translated as "but" means "but", "however", and "on the other hand". Since it always falls in the second position, translating it as "however" often captures its feeling better. 

my -- "My" is the first-person possessive singular pronoun. This pronoun follows the noun so "of mine."

missing "the/this"-- (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. 

words -- (CW) "Word" is translated from a Greek word that means "calculation," or "reasoning," but it has many, many specific meanings from "deliberation" to "narrative."  It is the source of our word "logic" and is the root word for all the English words that end in "-ology." Most biblical translations translated it as "word" for somewhat poetic reasons. However, when applied to people, it means "repute" or "reputation." More about this word in this article. In English, we would say "logic," "concept, or "reasoning" to describe it but it also means the communication of various types, so "message" often works. "Teaching" might work but it is unrelated to the common words for "to teach," "teacher," and "student" that all have the same root.  CW - Confusing Word -- The "word" does not capture the word's specific meaning.

will -- (WW)This helping verb "shall" does not indicate the future tense, but that the following verb describes a possibility, the subjunctive voice. A "might" or "should" in English is more appropriate, but is assumed in an "if" or "when" clause. Helping verbs are not needed in Greek since the main verb carries this information in its form.

never -- The "never" here is both of the Greek negatives used together. Greek has two negatives, one objective, one subjective. The use of both together is more extreme, like saying "you cannot really think" or, more simply, "never".

dissappear. -- (WW) The "dissappear" is from a verb that means  means one thing going by another, one thing surpassing by another,  or the "passing" the time. It also has the sense of arriving to a place and to "pass" a test. It does not mean "pass away" as in dying. The form is not the future tense, as implied, but in a form that means something is possible and "should" or "might" happen.