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

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

they -- This is from the third-person, plural form of the verb.

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.

see -- (CW, WV) "Shall see" is a verb that means "to see", "to behold", "to look", "to aim at", "to look towards", and similar meanings. It is not one of the common words for simply saying"see". Jesus uses this verb in a specific way,  in the future tense and the middle voice. The middle voice means that the subject is acting for or by themselves so "will behold for yourself". However, it also has the same root as the Greek word "eye", so "will behold with your own eyes" comes the closest. It is a light-hearted way to make a promise about the future. 

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".

coming -- The word translated as "coming" primarily means "to start out". It indicates movement, especially its beginning, without indicating a direction toward or away from anything, so it works either as "come" or "go", but it is more like our phrase "being underway". It is in the form of an adjective describing someone acting on or for themselves.

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

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

cloud -- "Cloud" is from a word that means "clouds", "mist" and "fog".

with -- "With" is from the Greek word that is almost always translated as "with" or a related concept such as "among" or "by the means of".

power -- "Power" is from a word that describes abilities and capacities, what actions a person can do or has done so "power", "might", "influence", "authority" and "force". This is the "influence" that was shaken in the previous verse when the sun and moon darken and stars fall.

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

great -- The word translated as "great" means many in number, great in power or worth, and large in size.

glory - (CW)-"Glory" is a word that means "expectation", "notion", "opinion", "repute" and "popular repute". Translations as "glory" or "splendor" are found exclusively in translating the Bible. The English word "recognition" seems to fit most consistently with its use by Jesus. The word "soul" has a religious meaning that the Greek word didn't have.