If c is succeeded by e, i or y, it is pronounced as s or ts (instead of k).
"ch" is pronounced as in "echo" or "chrome".
"rh" is pronounced as r.
"th" is pronounced as t.
"ph" is pronounced as f.
If i is unstressed before a vowel, it is pronounced like in "onion" or "phobia" (instead of like in "machine").
If "ti" is unstressed before a vowel and not preceded by s, it is pronounced like "tsy" in "gets you", "sy" in "pass you" or "ty" in "let you" (instead of as "ti").
If u is unstressed before a vowel, it is pronounced like in "persuade" or "superfluous" (instead of like in "plural").
If y is unstressed before a vowel, it is pronounced like in "yes" (instead of like in "machine").
There exist unassimilated guest words which retain their original pronunciation and spelling minus all redundant diacritical signs.
Other
The sequence "de le" is replaced by "del".
The sequence "a le" is replaced by "al".
If noun ends with a consonant, it takes plural in -es (instead of -s).
If noun ends with c, it takes plural in -hes (instead of -s or -es).
Not all adverbs are derived from adjectives.
If adjective ends with -c, adverb derived from it takes -amente (instead of -mente).
If verb ends with -ir, present particle replaces it with -iente (instead of -inte).
If verb ends with -er, past particle replaces it with -ite (instead of -ete).
10 is "dece" (instead of "unanta" as derived from "un").
20 is "vinti" (instead of "duanta" or "danta" as derived from "duo").
30 is "trenta" (instead of "tresanta" as derived from "tres").
40 is "quaranta" (instead of "quatranta" as derived from "quatro").
1,000,0002 is "billion" (instead of "dillion" as derived from "duple").
1,000*1,000,0002 is "billiardo" (instead of "dilliardo" as derived from "duple").
1,000,0004 is "quatrillion" (instead of "quadrillion" as derived from "quadruple").
1,000*1,000,0004 is "quatrilliardo" (instead of "quadrilliardo" as derived from "quadruple").
A power of 1,000 above 1,000 has "de" between it and the counted objects.
Optional
Pronunciation
if s is between vowels, pronounced like in "these" (instead of like in "stay")
if x is between vowels, pronounced like in "exact" (instead of like in "fox")
Other
"es" as present tense of "esser" (instead of "esse")
"son" as plural present tense of "esser" (instead of "esse")
"era" as past tense of "esser" (instead of "esseva")
"sia" as subjunctive of "esser" (instead of "esse")
"ha" as present tense of "haber" (instead of "habe")
"va" as present tense of "vader" (instead of "vade")
