missing "but"  -- (MW) The untranslated word  slated 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").  When used with a conditional starting a clause, the sense is "if/when...then." When used with a particle meaning "indeed" the sense is "on one hand...on the other hand." In a listing, the sense is "then" or "yet." After an interruption, "so then."

Why -- The Greek word translated as "why" in the singular means "anyone," "someone,"  "something," and "anything." The same forms are used both for the masculine or feminine so "anyone" works best for a person. In the plural, it means "everyone," "some," "they," and "those." Jesus often uses it to start a question so it means "who," "what," or even "why."

do -- This English helping verb is used to create questions, commands, negative statements, and smooth word flow in translation from Greek

you -- This is from the second-person, singular form of the verb.

look -- The verb translated as "look " means "to see," "to look to," "to look like," "to beware," and "to look for." It is the more tangible sense of seeing, such as seeing what is right in front of you rather than understanding so  "watch" works better.  "Look" does not work as well because it doesn't take a direct object and this word does.

at -- (IW) There is nothing that can be translated as "at" in the Greek source.  It is added because translating the previous word as "look" requires it.

the  -- The word translated as "the" is the Greek definite article, "the," which usually precedes a noun. Without a noun, it has the sense of "the one." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

speck -- The Greek term translated as "mote" means something small like "twig", "straw," or "chaff." These terms, especially "chaff" have the sense of "trash", "rubbish," and "remains."

 of sawdust -- (IW) There is nothing that can be translated as " of sawdust " in the Greek source.  It is added because translating the previous word as "look" requires it.

missing "the one"  -- (MW) The untranslated word "the one" is the Greek definite article, "the one," which usually precedes a noun. Without a noun, it has the sense of "the one." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

in -- The word translated as "in" means "in," "within," "with" (an instrument), "by" (near), "by" (means of), "during" (time),  or "among"  with a dative object as the one here.  With the accusative, it means "into," "on," and "for." When referring to time, it means "during." It can mean "on," "at," or "by" in the sense of "near."

your --  -- The word translated as "your" is the genitive form of the singular, second-person pronoun, which is most commonly the possessive form.  It follows the noun so "of yours." This pronoun follows the noun so "of yours." As a genitive object of a preposition, as here, it means a movement away from something or a position away from something else.

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." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," and "those"). See this article for more. 

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." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," and "those"). See this article for more. 

brother -- The word translated as "brother" means a biological brother, any kinsmen, and more broadly and friend or associate.

's  -- The apostrophe "s" comes from the noun's genitive form. This case usually requires the addition of a preposition in English.  The most common is the "of" of possession for which an apostrophe "s" can be substituted. However, it can also mean "belonging to," "part of," "which is," "than" (in comparisons), or  "for," "concerning" or "about" with transitive verbs.

eye, -- The Greek word for "eye" is the more technical terms for "eye" but it also means "sight." In Greek, an eye is a metaphor for comfort and cheer.

and -- (WW) The Greek word translated as "and" 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. 

pay  - (CW)The word translated as "pay...attention" primarily means "observe well" and "understand". It is based on a root word that means "to understand" or "to perceive with the mind". It has a specific sense of coming to understand something. This translation is more specific than the word's meaning.

no -- 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. When a negative precedes the verb, it affects the whole clause. When it precedes other words, its force is limited to those words. 

attention to -- This completes the meaning of the verb.

missing "the one"  -- (MW) The untranslated word "the one" is the Greek definite article, "the one," which usually precedes a noun. Without a noun, it has the sense of "the one." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more.

the  -- The word translated as "the" is the Greek definite article, "the," which usually precedes a noun. Without a noun, it has the sense of "the one." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

plank "Beam"is Ia Greek word that means "bearing-beam", "main beam", "plank", "support", "beam", "strut", "brace", "firewood", "bar [of a gate or door]," and "a kind of meteor."

that  -- The word translated as "the" is the Greek definite article, "the," which usually precedes a noun. Without a noun, it has the sense of "the one." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

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

in -- The word translated as "in" means "in," "within," "with" (an instrument), "by" (near), "by" (means of), "during" (time),  or "among"  with a dative object as the one here.  With the accusative, it means "into," "on," and "for." When referring to time, it means "during." It can mean "on," "at," or "by" in the sense of "near."

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." Before an adjective, participle, or infinitive it changes the following word to act like a noun. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," and "those"). See this article for more. 

your own -- The word translated as "his" is a very unusual word. It is not the very common pronoun usually translated as "his," but a specific word that means "one's own," "pertaining to oneself," and "private." This is usually translated as "his own."

eye? -- The Greek word for "eye" is the more technical terms for "eye" but it also means "sight." In Greek, an eye is a metaphor for comfort and cheer.and statements, negating both single words and sentences. The other negative adverb, μή applies to will and thought; οὐ denies, μή rejects; οὐ is absolute, μή relative; οὐ objective, μή subjective.