missing "and"  -- (MW) The untranslated word "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

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

know -- 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. It is the past perfect tense so "have seen" but it is translated as the present tense of "know."  What someone "has seen" is what they "know" in the present. Since the past perfect of "see" forms the present tense of "know" the pluperfect tense used here, which indicates an action completed before some other action in the past, is used as the simple past tense, "knew."

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

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

missing "the/this"  -- (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. 

commandment  -- The word translated as "commandments" has the sense of a direct "order" or "command" given by someone as opposed to a body of law or tradition in society. Jesus uses it to refer to the written Law, his lessons, and the commands given by someone in authority.

leads -- (WW) 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.

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

eternal: -- (CW) "Eternal" is an adjective based on the word that means "age" or "eon." It has the sense of "perpetual" or "ageless." It doesn't really means "eternal or "everlasting" as we used those words today.  See this article.

life -- The word translated as "life" means "living" but it also means "substance," "existence," and "property."Jesus uses it to mean the "existence" of physical life, spirit plus body. To learn more read this article on life eternal, For more on how Christ uses this word with other words about human existence (soul, heart, spirit, body, etc.), read this article.

 So -- The Greek word translated as "so" either emphasizes the truth of something ("certainly," "really") or it simply continues an existing narrative, "then," "therefore." Jesus uses it to respond positively to questions, but in parables, it can continue the story.

whatever -- The word translated as "whatever" is a demonstrative pronoun ("this" "that"), but it often acts as a pronoun "which," "what," "who," "whosoever," "where," "for which reason," and many similar meanings.

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."

say -- (CW) The Greek word translated as "say" is not the ordinary "to say," "to talk," "to tell," or "to speak" in Greek. This word means "idle chatter," "gossip," and "the proclamations of an oracle." Jesus uses it to capture the idea of "passing on." "conveying,"  or "relaying" information.  When there isn't an object, "transmit" captures the idea of being a conduit rather than a source of information.

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

just what -- "Just what" is from a Greek word that means which means "even as," "how," and, in relating to time, "as" and "when."

the -- The word translated as "the" is the Greek definite article. When not preceding a noun, takes the meaning of "the one" or, in the plural, "the ones." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

Father -- "Father" is the Greek noun that means "father" or any male ancestor so "forefathers." It is the word that Christ uses to address his own Father.

has -- This helping verb "has" indicates that the verb is the tense indicating an action completed in the past.

told - The word translated as "speak" means "to say" and "to speak." It is one of the two most common words translated "speak," "say" and "tell," but it has more a sense of addressing and proclaiming.

me, -- The "me" is in the indirect object form of the first-person pronoun, so usually "to me,""for me," and "by me."

missing "so"  -- (MW) The untranslated wordv"so" is in its adverbial form, so it means "in this manner," "so much," or "in this way."

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

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

say. -- (CW) The Greek word translated as "speak" is not the ordinary "to say," "to talk," "to tell," or "to speak" in Greek. This word means "idle chatter," "gossip," and "the proclamations of an oracle." Jesus uses it to capture the idea of "passing on." "conveying,"  or "relaying" information.  When there isn't an object, "transmit" captures the idea of being a conduit rather than a source of information.