Though -  "Though" is from a conjunction that means "and if," "even if," and "although."  It is a contraction of the conjunction "and" that joins and the particle that indicates a possibility,

I -- The pronoun "I" is used here. Since, as the subject of the sentence, it is part of the verb, its explicit use accentuates who is speaking "I." Saying "I myself" captures this feeling in English.

missing "myself" -- (MW)  The subjective pronoun repeats the information in the verb so it should be repeated in English like "I myself."

missing "should" or "might"-- (MW) A helping verb is necessary because the following verb is a verb of possibility, a subjunctive, something that "should" or "might" occur. The helping verb is not needed in a clause beginning with an "if" or a "when." The "though" above translates out the "if."

bear record - (CW) "Bear record" is the Greek verb that means "to give testimony" and "to bear witness." It has the sense of being true testimony. It is the verb form of the Greek word for "testimony" and "proof," which is the source of our word "martyr," and its funny spelling.

of -- (CW) The Greek word translated as "of" means "around" when referring to a place, but in referring to a subject, it means "about," "concerning," "on account of," and "in regard to." This is the way Jesus usually uses it. It is not common word "of."

myself, -- The Greek reflexive pronoun is translated as "myself."

yet --- (IW) There is nothing that can be translated as "yet" in the Greek source.

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

missing "the"  -- (MW) The untranslated word is the Greek definite article,"the," 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. 

record - (CW) "Record" is from a Greek word that means "testimony," "proof," and "evidence."

is -- The verb "is" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics. With the genitive object, the sense is "belongs to."

true: - The word translated as "true" primarily means "unconcealed", based on the noun form, which means "what is not hidden."   It therefore means "so true," an accentuated form of true, with nothing hidden.

for  -- The word translated as "that" introduces a statement of fact or cause, "for what," "because," "since," and "wherefore."

I -- This is from the first-person, singular form of the verb.

know -- (WT) The word translated as "know" means primarily "to see" and is used to mean "know' as we use the word "see" to mean "know" in English. The tense is the past, perfect, "have seen."

whence -- "Whence" is from an adverb which means "whence" and "from what source."

I -- This is from the first-person, singular form of the verb.

came, -- The word translated as "came" primarily means "to start out" but Christ usually uses it to mean "come" but not always. It indicates movement, especially its beginning, without indicating a direction toward or away from anything, so it works either as "start," "come," or "go," but it is more like our phrase "being underway." Our English word "show up" captures both the "start" and "come" ideas. See this article for more.

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 can be translated as "not only...but also."

whither -- The word translated as "whither" means as a pronoun "where?", "at what point," and [of manner] "how."  Jesus always seems to use it as "where."

I -- This is from the first-person, singular form of the verb.

go; -- "Go" is a Greek verb that means literally "go under" or "bring under," and Jesus uses it to mean "go," but he often uses it to mean "go away" and "depart."

but -- The Greek word translated as "but" means "but," "however," and "on the other hand." It joins phrases in an adversarial way. Since it always falls in the second position, translating it as "however" often captures its feeling better.  It can also be an explanation of cause ("so").

ye -- The pronoun "you" is used explicitly as the subject of the sentence. Since it is already part of the verb, its use here creates emphasis on the "you" as we might say "you yourselves." It is plural.

missing "yourselves"  ---- (MW) The pronoun is used here explicitly as the subject of the sentence. Since this information is already in the verb, the sense is repetitive as we say "you yourselves."

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

not -- The Greek word translated as "not" is the Greek negative used to deny objective facts, not opinions. It means "no," "not," or"no truly." It makes a negative statement of fact. Adding "really" to the sentence captures the same idea. When a negative precedes the verb, it affects the whole clause. When it precedes other words, its force is limited to those words.

tell -- (CW, WT) The word translated as "tell" means primarily "to see" and is used to mean "know' as we use the word "see" to mean "know" in English. This words was translated as "know" above. The tense is the past, perfect, "have seen."

whence -- "Whence" is from an adverb which means "whence" and "from what source."

I -- This is from the first-person, singular form of the verb.

come, -- (WV) The word translated as "come" primarily means "to start out" but Christ usually uses it to mean "come" but not always. It indicates movement, especially its beginning, without indicating a direction toward or away from anything, so it works either as "start," "come," or "go," but it is more like our phrase "being underway." Our English word "show up" captures both the "start" and "come" ideas. See this article for more. This is the middle voice, a change from the previous "came."

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 can be translated as "not only...but also."

whither -- The word translated as "whither" means as a pronoun "where?", "at what point," and [of manner] "how."  Jesus always seems to use it as "where."

I -- This is from the first-person, singular form of the verb.

go; -- "Go" is a Greek verb that means literally "go under" or "bring under," and Jesus uses it to mean "go," but he often uses it to mean "go away" and "depart."