How to pronounce [er] in Chinese Pinyin

Keep your tongue in the position of “e” and then slightly roll up tip of your tongue.

[er] as a separate sound in the syllable but not form a syllable alone sometimes. It is usually combined with another final to develop a retroflex final which is represented with character儿 in actual writing. The sound of [er] less or more sounds like the “er” in the word “are” in English.