missing "because"  --  The untranslated word "because" doesn't appear in all early manuscripts, but it  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." 

And -- 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."

if - (CW) "If" indicates more of an expectation of something happening than "if" alone. This is how we use the word "when." It can be used after a demonstrative pronoun to mean "that possibly," "whosoever," or "whatsoever." This is not the simple "if."

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

do good to - The verb translated as "do good" means "to do good", "to do well", "to act rightly," and "to exert a beneficial influence." It combines the verb meaning "to make" or "to perform" with the common Greek adjective meaning "useful", "worthwhile," and "of high quality."  "worthwhile," and "of high quality." This word only appears in the Bible and in the works a thousand years after Christ of Claudius Ptolemy. an Alexandrian mathematician, astronomer, astrologer, geographer, and music theorist.  See this article on "good" and this one on "evil."

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.

are good to -- (WF) The verb translated as "to do good" means "to do good", "to do well", "to act rightly," and "to exert a beneficial influence." It combines the verb meaning "to make" or "to perform" with the common Greek adjective meaning "useful", "worthwhile," and "of high quality." See this article on the real Greek meaning of the terms translated as "good" and "evil." 

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". Here, the sense is gratitude.

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 indirect object, the "you" here, the object acts like a possessive and "it is to him" but a smoother translation is to change the verb to "have" with the object and the subject reverses, "what gratitude have you." In the context of "having gratitude," we usually say something like "what gratitude."

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.

do -- The Greek word translated as "to do" has the primary meaning of "making" or producing" something or "causing" or "performing" as service. When it means It describes a productive action.  In English, "do" is also frequently a helper verb. This Greek word is not used as broadly.

that-- The word translated as "that" 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

missing "same"  -- (MW) The untranslated word  "same" is the Greek word commonly translated as third-person pronouns in English.  Here it is neuter in the form of a subject or object of a verb or preposition.  When used as a noun, it is preceded by a definite article, and it means "the same." This form is neuter, which implies the thing being done.