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

this - The word translated as "this" means "from here" or "this/that thing."

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. 

gospel  - "Gospel" is from a noun that originally meant "a reward for good tiding given to a messenger." It was customary to reward a messenger who brought good news in the same way that we might tip someone. It later was used to denote "good tidings" and "good news" itself.

of -- This word "of"  comes from the genitive case of the following word that requires the addition of a preposition in English.  The most common is the "of" of possession.

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. 

kingdom  - The word translated as "kingdom" can be the region, the reign, the castle or the authority of a ruler. Christ does not seem to use it to mean a physical region, so its translation as "reign" or "realm" seems more appropriate. This is especially true because the "reign" of a king means the execution of his will.

shall -- This helping verb "shall" 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.

preached  -  (CW) "Preached" is from a verb that means "to be a herald" and "to announce." In the passive, it means "to be proclaimed or announce." It is also the word used to describe the crowing of a cock at dawn. It does not indicate sermonizing on religious topics.

in  - The word translated as "in" also means "within," "with," or "among."

all  - (CW)  The first word translated as "all" means something that is "complete" or "the whole" of something, and can mean "the whole universe" as well as being "safe and sound" in being kept "whole."

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. 

world  - (CW) The noun translated as "world" is not the Greek word usually translated as "the world." This uncommon word means "the inhabited region." It was often used to denote the civilized world as separate from the lands of barbarians.

for  - The word translated as "for" means "into" a place, "towards" as a direction, and "for" a purpose.

a -- There is no indefinite article in Greek, but when a word doesn't have a definite article, the indefinite article can be added in English translation.

witness  - The Greek noun translated as "witness" is from means "testimony" and "proof.

unto -- This word "unto" comes from the dative case of the following word that requires the addition of a preposition in English. The most common is a "to" for the English indirect object.

all  - The adjective translated as "all" is from the Greek adjective meaning "all," "the whole," "every," and similar ideas. This is the word usually translated as "all." This is an indirect object, matching the "nations" below. This is the common word for "all" not the one used above.

nations;  - The noun translated as "nations" means "a group of people living together," a nation, a tribe, or a cast of people. Later it came to mean "barbarous nations" similar to our idea of ethnic people. This is the word usually translated as "gentiles" in the NT.

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

then -- The Greek word for "then" means "at this time" or "then." With the subjective negative, the sense is "not when."

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

end - (CW) The word translated as "end" means "purpose," "outcome," "something done," or "goal." It is the term Jesus uses to describe the culmination or the purpose of an era or lifetime. It is more of an accomplishment than simply ending a task.  Its use in the phrase "end of the world" is discussed in this article.

come.  - (CW) The verb translated as "shall come" means "to arrive," "to have come," "to be present," and "to have reached a point." It is a metaphor for "to be a follower." This is not the common word translated as "come."