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

If -- The "if" here is used to express conditions "if" (implying nothing about its fulfillment) or indirect and direct questions, "whether."It also means "if ever" and "whenever." When used in an "if" clause, the verb is the subjunctive form of possibility. When citing a fact  the sense is more  "whether," "since" or "as sure as." When this word is paired with the conjunction translated as "but" or "however," the structure works like an "if then" statement in English.  With verbs of desire and emotion and the indicative in the second clause, the sense is "that." With an imperative, it is used to express a wish. The sense is "I wish that." With the future tense indicative, it is used for emphasis, a warning, or an intention. The emphasis clause is after the main statement.

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

love  -- (CW) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.

those -- The word translated as "them" 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. 

who -- (IW) There is nothing that can be translated as "who" in the Greek source. It was added because the next verb was translated as active rather than as a participle.

love -- (CW, WF) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.  This word is a participle, not an active verb.

you, -- The "you" here is the second-person, plural pronoun in the form of an object of the action or preposition. As the object of a preposition, an accusative object indicates movement towards something or a position reached as a result of that movement.

what -- The Greek word translated as "what" means "of what kind," "whose," "what," and "which."

credit --  The Greek word translated as "thank" is complicated. It means the appearance of beauty and grace. On the part of a doer, it is "kindness" and "goodwill". On the part of the receiver, it means "thankfulness" and "gratitude". Generally, it means gratification", "delight",  with many special uses. It is the subject of this phrase. It also means "the owed gratitude" and "to be beholden". This is not the specific meaning of the word in this situation.

is -- (The verb "have" 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.  The word also means "to exist" and where it doesn't connect to characteristics or conditions. With an object in the possessive form the "is" becomes "is of," which can mean "it is descended from," "it is the type of," "it belongs to," "is made of," "is a duty of," "is at the mercy of," or " is dependent on."   With an indirect object, the object acts like a possessive and "it is to him" becomes "it is his" or the verb can act like "have" with the object and the subject reverses, "he has it." With the preposition "into", the sense is "consist of."When the verb "to be" appears early in the clause before the subject, the sense is more like "it is" or, in the plural, "there are."

that -- (IW) There is nothing that can be translated as "that" in the Greek source. While we can assume a repeated object, we cannot assume a demonstrative pronoun.

to -- This word "to" 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.

you? -- The Greek pronoun "you" here is plural and in the form of an indirect object, "to you," "for you," etc.

missing "for"  -- (MW) The untranslated word  "for" introduces a reason or explanation so "because" and, in questions, "why." However, since this word always appears in the second position, it is more like an aside remark like, "consequently" or "as a cause." 

Even -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis, "even," "also," and "just."In a series, it can be translated as "not only...but also." After words implying sameness "as."

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.

sinners . -- (CW) "Sinners" is word that means "erroneous" or "erring." It also means "of bad character" but with the sense of being a slave or low-born not evil. Only in biblical translations is this term given the sense of wickedness. More about the translation issues regarding "sin" here.

love -- (CW) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.

those  -- 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. 

who -- (IW) There is nothing that can be translated as "who" in the Greek source. It was added because the next verb was translated as active rather than as a participle.

love  -- (CW, WF) The word translated as "love" expresses a lot of different ideas including "to be fond of," "to greet with affection," "to persuade," and "to be contented with." Jesus however, applies it to relationships where we have a duty to care for others: family, God, etc. Another word, also translated as "love," is used to for relationships of affectionate friendship that are more voluntary. To distinguish this word, translating it as "cares for" seems to work best. See this article on love for more information.

them. -- The word translated as "them" is the Greek word commonly translated as third-person pronouns in English in the form of a plural object of a verb or preposition. As the object of a preposition, an accusative object indicates movement towards something or a position reached as a result of that movement.