Tips for the “ian” sound:
ian = i + an; like English “yen”.
“ian” reads as “ee-en” (quickly). “an” after “ i” sounds between “man” and “men” in English.)
Tips for the “in” sound:
“in”(ien) sounds like “een” as in “seen,” like the “ine” in “machine.”
It is mostly spelt as “in.”
Tips for the “iang” sound:
It sounds like “ee-ahng” without interference between the two.
Tips for the “ing” sound:
“ing”(ieng) is similar to “ing” as in “ring.”
Tips for the “iong” sound:
iong = i+ong
It goes like “ee-ong” (quickly), almost like German “jung.”