Sounds like "ee" as in "bee" but with the lips rounded like "u" as in "rune". Same as "u" in French "tu" or ü in German "über".

Sounds like "e" as in "yes".

Sounds like "ar" as in "car". In some northern dialects of Chinese, the final of some syllables can change to become r-colored.

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)