If -- (CW) The word translated as "if" means  "if might" indicates more of an expectation of something happening than "if" alone. This is often how we use the word "when."

missing "however"  -- (MW) The untranslated word  "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.  

anyone - (CW) The word translated as "anyone " is a demonstrative pronoun, but it often acts as a pronoun, especially a connective pronoun introducing a dependent clause. This is not the Greek word normally translated as "anyone."

causes -- "Causes" is a verb that means "to cause to stumble" or "to trip up." From there it is assumed by its translators to mean "to give offense" and "to scandalize." Our word "scandalize" comes directly from the Greek, but this is a word that Jesus always uses humorously.  See this article for more.

one The Greek word translated as "one" means "one" (as opposed to other numbers), "single," and "one and the same."As in English, it can be used as a pronoun, meaning a single person.

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.

these -- The word translated as "these" means "from here" or "this/that thing. This word comes after "little ones."

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

little ones  - "Little ones" is from an adjective, used as a noun, which means "small," "little," and "young." So, "the little" or, in the plural as used here, "little ones." It is a change from the noun used in the previous verse that means specifically refer to "little" or "young" children. See this article about the words Jesus uses for children.

—those - The "those" is the Greek definite article, which without a noun 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 previous verb was translated as active rather than a participle.

believe  - (WF) "Believe" is from a verb in the form of an adjective used as a noun, which means "to trust in," "to rely on," and "to put your faith in" a person. So, it is "the ones trusting in me." This Greek word does not apply to religious belief as much as it does trusting in other people, especially their words.

in -- The word translated as "in" means "into" a place, "towards" as a direction, "in regards to" a subject, and "up to" limits in time and measure.

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

to stumble -- This finishes the idea of the "causes" Greek verb above.

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

would -- -- (WT) This helping verb "would" indicates that the verb indicates a possibility not the future tense. Helping or auxiliary verbs are needed to translate the Greek verb forms into English. A "should" or "might" is correct.

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

better  -  (CW) The verb translated as "be better" means "to bring together," "work with," and "agree with." The word translated as "it is expedient" primarily means "to collect" or "bring together." One of its secondary meanings is "to confer a benefit." It was used like we use the phrase "getting it together" to mean making an improvement. Jesus always uses it humorously playing on the "getting it together" sense of improvement.

for -- This word "for" 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. However, the translator can choose other prepositions: "with,"  "in,"   "of,"  "as," "by," "for," "at," or "on" depending on the context. The case can indicate a "with" for instruments, an "in" for locations, an "as" for purposes, an "about" (or "for" or "against") indicating interest, an "of" for possession, a "by" for agents, an "as" for comparisons, "at" or "on" a time, and an "in" for area of effect. -

them - (WN) The word translated as "them " is the Greek word commonly translated as third-person pronouns in English.

missing "that"  -- (MW) The untranslated word  "that" is an adverb "in that place," "there," "where," "when," or as a conjunction that starts a subordinate clause  "that," "when," "in order that" or "because."

to -- (IW) There is nothing that can be translated as "to" in the Greek source. There is no infinitive here.

have -- (WW) This helping verb should be "be" to indicate that the verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

a -- There is no indefinite article in Greek, but when a word doesn't have a definite article, the indefinite article can be added in English translation.

large   -- (CW) The word translated as "large" is an adjective that means "of an ass," and "for an ass." Since it was moved by an ass, it is a large millstone.

millstone  - "Millstone" is from two Greek words. The first word is any type of "mill," "millstone," "grinder," and "stone."

missing "should"  -- (MW) The untranslated word "should" is needed for the form of the verb of possibiliy is not shown in the English translation.

hung- "Hanged" is from a verb that means "to hang" and, in the passive, "to be hanged." Interestingly, it also has a little of the sense we used in phrases such as to be "hung up" on something as in to be "wholly taken up with it."

around -- The Greek word translated as "around" means "around" when referring to a place, but in referring to a subject, it means "about," "concerning," "on account of," and "in regard to."

their - (WN) The word translated as "their " is the Greek word commonly translated as third-person pronouns in English.  It appears after "neck." The form is "that neck of his." 

missing "the"  -- (MW) The untranslated word is the Greek definite article, which usually precedes a noun and, without a noun, takes the meaning of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those"). See this article for more. 

neck,  - "Neck" is from the Greek word that means "neck" and "throat."

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

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

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

drowned  - "Drowned" is from a verb which means "to be thrown in the sea," and "to drown," but the prefix on it means "downward," so the sense is "down in the sea."

in  - The word translated as "in" means "within," "with," or "among."

the -- The word translated as "the" is the Greek definite article. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

depths  - "Depth" is from a noun, which "the high seas," and "to open sea." It distinguishes the deep sea from the shallow shore regions. It is a metaphor for a large amount of anything, as we would use "a sea of troubles."

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.

the -- The word translated as "the" is the Greek definite article. The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

sea.  - "The sea" is from a word that means also means "sea" or "sea water."