Sounds like "n" as in "no".

ㄋㄧˇ

you

ㄋㄢˊㄅㄧㄢ˙

south

南边

IPA: [n]

Sounds like "f" as in "far".

ㄈㄚˇ

law

ㄈㄢˋㄈㄚˇ

break the law

犯法

IPA: [f]

Sounds like "a" as in "palm" + "n" as in "no".

ㄋㄢˊ

difficult

ㄋㄧㄢˊ

year

IPA: [an ~ ɛn]

Sounds similar to "en" as in "often" or "un" as in "sun", but slightly different.

ㄇㄣˊ

door

ㄇㄧㄢˋㄈㄣˇ

flour

面粉

IPA: [ən]



Single-syllable audio courtesy of the AllSet Learning Chinese Pronunciation Wiki, used with permission.

HSK word audio courtesy of Audio-cmn. (CC BY-SA 3.0)