As long as -- The word translated as "as long as" means "until" but it also means "till," "while," "as long as," "in order that."   With the particle of possibility and the subjunctive form of the verb, the sense is until some unknown time.

it -- This is from the third-person, singular form of the verb.

is -- 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.

day: -- The Greek word translated as "day" also means "time," in general, and refers specifically to the "daytime."

we -  - (WF) "We" is the 1st person, plural, accusative pronoun. Jesus only uses this pronoun in seven verses this pronoun seven times, most often in the Lord's Prayer.  It is not the subject of the verb but the object. 

must -- (WF) The Greek verb translated as "must" is a special verb that means  "it is needful," and "there is a need." It is always singular, 3rd person. It can also mean "to lack." It works something like our word "must" but its form is fixed. It works something like our word "must" but its form is fixed. It means "it is necessary" or "it is needed." It usually takes an infinitive verb as its object. It is not a helper verb but the active verb in the sentence.

do - (WW, WF) Jesus uses a very businesslike term that means "to labor," "to trade," "to do business," "to earn by working," and "to acquire."  It is from the same root as the word translated as "works" or "deeds." It means "work," "do," or "make," but it is not the common word Christ uses that is always translated as "do," but a more sophisticated word he uses less commonly. It is in the middle voice and an infinitive. The form is where the subject acts on himself, so "to work yourself."

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. 

works -- The Greek word translated as "works" means "deeds," "actions," and "things" in the sense of "every thing."

of -- This word "of"  comes from the genitive case of the following word that requires the addition of a preposition in English.  The most common is the "of" of possession.

him -- (WW) The word translated as "him" 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.

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.

sent -- (WF)  "Sent" is from a Greek verb that means "send," "send forth," "send away," "conduct," and "escort." This is the second most common word Jesus uses that is translated as "send out," but this one doesn't have the prefix that has the sense of "out." It is not an active verb, but a participle introduced by an article, "the one sending."

me, -- "Me" is the regular first-person pronoun in Greek as the object of the 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.

Night -- "Nights"  is the noun that means "night," "midnight," and is a metaphor for darkness. --

is -- This helping verb indicates the present tense of the verb. It is used here to form the present, progressive tense, which doesn't exist in Greek but which can smooth the flow of English sentences.

coming,, -- The word translated as "come" primarily means "to start out" but Christ usually uses it to mean "come" but not always. It indicates movement, especially its beginning, without indicating a direction toward or away from anything, so it works either as "start," "come," or "go," but it is more like our phrase "being underway." Our English word "show up" captures both the "start" and "come" ideas. See this article for more.

when - "When" is from an adverb/conjunction that means "when," "as when," "at the time when," and "sometimes."

no one- The Greek adjective translated as "no one" also means "no one," "nothing," and other negative ideas. It is used by Jesus more like a negative pronoun than an adjective.  However, to avoid the English double-negative, we translate it as its opposite "anyone" when used with another Greek negative.

can -- (CW) The word translated as "can" means having the power or possibly a desire to accomplish something. Often, in English, "can" is a helper verb, indicating a possibility. In Greek, it indicates ability or power. This is the active verb here, not a helper verb. It takes an infinitive as "have the ability" does in English.

work. - (WF)  Jesus uses a very businesslike term that means "to labor," "to trade," "to do business," "to earn by working," and "to acquire." It is from the same root as the word translated as "works" or "deeds." It is in the middle voice and an infinitive. The form is where the subject acts on himself, so "to work yourself."