Then " -- The "when"  is from an adverb meaning "when," "at what time," "at some time or other," "at some unknown time, and "at some time in the future."

the - The word translated as "the" is the Greek definite article, without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

righteous -- This is from the second-person, singular form of the verb.The word translated as "the righteous" is a noun that means "the virtuous" but it is also a play on the idea of "the right." The two words are similar in Greek, though not as similar as in English.

will -- This helping verb "will" indicates that the verb is the future tense. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

answer-- This is from the second-person, singular form of the verb."Shall answer" is a verb that means to "set apart," "choose," "answer" a question, "answer charges," and "defend oneself."

him,-- The word translated as "him" is the Greek word commonly translated as third-person pronouns in English.

missing "saying"  -- (MW) The untranslated word "saying" is the most common word that means "to say," and "to speak." It is in the form of a participle, "saying" and "speaking."

Lord,-- This is from the second-person, singular form of the verb.The Greek word translated as "lord," means "having power," "being in authority" and "being in possession of" and means "lord" or "master."

when -- The "when"  is from an adverb meaning "when," "at what time," "at some time or other," "at some unknown time, and "at some time in the future."

did -- This helping verb is used to create questions, commands, negative statements, and smooth word flow in English, but the Greek could be either a question or a statement.

we -- This is from the first-person, plural form of the verb.

see -- The verb translated as "see" means "to see" but it is often used like we use the word "see" to mean "to know" or "to perceive."

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

hungry ,  - (WF) The "an hungered" here is the same verb translated as "hungry " in Matthew 25:35, but here it is in the form of an adjective, "hungering."

and , or and give you something to drink?

and  - -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also").

feed - The word translated as "feedeth" doesn't mean feed as much as the idea of "nurturing" or "causing to grow." It is not the words used in Matthew 25:35 to means "give to eat." It was, however, used in Matthew 6:26 to refer to caring for birds regarding food. Since its primary meaning is "to thicken," the sense might be described better as "to fatten up."

you? -- This English objective pronoun is added and not in the Greek source.   In Greek, pronoun objects are not repeated after each verb because they are implied by their first occurrence.

or -- "Or" is translated from a Greek word that means primarily "or" but serves as "than" in a comparison. The same word could also be the exclamation "hi" or the adverb meaning "in truth."

thirsty,  - (WF) The word for "thirst" is the same used in Matthew 25:35 that means "to be thirsty" or, more generally, "to want" or "lack" anything. It is in the form of an adjective, "thirsting."

and- -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also").

gave  - The "gave...drink," which is from a word that means "to give a drink," "to water," "to moisten," and metaphorically "to saturate one's mind." It is not the word the Christ always uses for "give" (as used above) or "to drink" but a word that he rarely uses.

you -- This English objective pronoun is added and not in the Greek source.   In Greek, pronoun objects are not repeated after each verb because they are implied by their first occurrence.

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

to drink: -- (WF) This finished the concept of the verb. This is not an infinitive verb.