Phonetic transcriptions in the International Phonetic Alphabet

Word Underlying phonological form Phonetic form
sing
/sɪnɡ/
[sɪŋ]
singer
/ˈsɪnɡər/
['sɪŋər]
singing
/ˈsɪnɡɪnɡ/
['sɪŋɪŋ]
However, these rules do not predict the following phonetic forms:
Word Underlying phonological form Phonetic form
anger
/ˈænɡər/
['æŋɡər]
finger
/ˈfɪnɡər/
['fɪŋɡər]
hunger
/ˈhʌnɡər/
['hʌŋɡər]
In the above cases, the /ɡ/ is not deleted. The words are all single 
morphemes
, unlike singer
and singing which are composed of two morphemes, sing plus -er or -ing. In theory, there is a

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minimal pair
consisting of hangar ('shed for aircraft'), which, containing no internal
morpheme boundary, is pronounced [ˈhæŋɡə] and hanger ('object for hanging clothes'), which
comprises two morphemes and is pronounced [ˈhæŋə]. Not all speakers use these
pronunciations consistently, however. Rule 2 can be amended to include a symbol # for a
morpheme boundary (including word boundary):
2. /ɡ/ 
→
∅
/ [ŋ] ___ #
This rule then applies to sing, singer and singing but not to anger, finger, or hunger.
However, there are exceptions in the form of comparative and superlative forms of
adjectives, where Rule 2 must be prevented from applying. The ending -ish is another
possible exception.