For  - (WW) The Greek word translated as "so" joins phrases in an adversarial way. Since it always falls in the second position, translating it as "however" often captures its feeling better.

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

bind  - -(CW) "Bind" is from a Greek word that means "to fetter," "to put in chains," "to tie together," and "to lay snares for."  Jesus only uses this word in this verse. It is not the common word translated as "bind" used by Jesus ten times.

heavy  - - The Greek word translated as "heavy" (used by Jesus in two verses) means "heavy in weight," "heavy with age, infirmity or suffering," "grievous," "oppressive," "causing disgust," and many other negative ideas. This negativity comes from the idea that negative things fall to earth and positive ones fly to the heavens. Its only positive meaning is "pregnant."

burdens  - "Burdens" is another Greek word Jesus only uses in three verses that means "load," "burden," and, in plural (as it is here) means "merchandise" and "wares." It is also a term for "a child in the womb."

and grievous to be borne, -- (OS) There is nothing in the Greek that can be translated as "and grievous to be borne" in the source we use today but it does exist in the source that the KJV translators used.

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

lay  - "Lay" is from another uncommon Greek word for Christ that means "to lay," "to put," "to impose," and "to place upon." Christ commonly uses its root form that also means "to put" but this version has a prefix emphasizing the idea of the being putting "upon" or "against" something.

them  - There is no "them" in the Greek source, it is added for clarity in English. In Greek, pronoun objects are not repeated after each verb because they are implied by their first occurrence.

on  - The word translated as "on" means "against," "before," "by" or "on." It is the same word used in the prefix of the verb "lay" used above.

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.

men's  - The Greek word for "men's" in the singular means "person" and "humanity" and "people" and "peoples" in the plural. If follows "shoulders" so "those of men."

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. 

shoulders;  - The Greek word "shoulders" means the "shoulder and upper arm" together, but it is used more generally like the word "shoulder" in English.

but  - The Greek word translated as "but" joins phrases in an adversarial way. Since it always falls in the second position, translating it as "however" often captures its feeling better.

they -- -- The word translated as "they" is the Greek word commonly translated as third-person pronouns in English. Pronouns are not usually used as a subject of a sentence because the information is in the verb so it is used for emphasis like we use "they themselves." Strangely enough, this word appears in the current Greek source, but it did not appear in the one that the KJV translators used.

themselves - This is needed to emphasize the subject. This is one of the few times where Biblical translators handle the subjective use of a pronoun correctly. But they did it where the pronoun did not appear.

will  - (CW) The Greek word translated as "will" is not the same as the helper verb "will" in English, which primarily expresses the future tense. Its primary purpose is to express consent and even a delight in doing something. It means "to consent" and "to be resolved to a purpose."

not  - The Greek word translated as "not" is the Greek negative used to deny objective facts, not opinions. It makes a negative statement of fact. Adding "really" to the sentence captures the same idea.

move  - (WW, WF) "Move" is a Greek verb that means "to set in motion," "to move," "to remove," "to change," and "to disturb." While "move" is the most common meaning, it just doesn't make sense here where the idea of "remove" fits better.   Jesus only uses this word in this verse.

them  - -- The word translated as "them" is the Greek word commonly translated as third-person pronouns in English.

with -- This word "with" 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. However, the translator can choose other prepositions: "with,"  "in,"   "of,"  "as," "by," "for," "at," or "on" depending on the context.

one of -- (IP) There is nothing that can be translated as "one of" in the Greek source.

their  - -- The word translated as "their" is the Greek word commonly translated as third-person pronouns in English. This pronoun follows the noun so "of theirs."

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. 

fingers.  - - (WN) "Fingers" is from another uncommon Greek word for Jesus, used only in five verses. It means "fingers," "toes," "the thumb" "an inch," and "a digit." It is used in the same sense that we might say, "keeping someone under your thumb." The Greek word is singular rather than plural, which is why the "one of" was added, but two wrongs do not make a right.