replacive allomorphs

Most of the allomorphs we have been dealing with have been additive, thar is we have bee forming words by adding prefixes and suffixes to bases, now we must look at an allomorph of different kind, the replacive, which can be illustrated by going back to the past tense. we noted that this morpheme has three allomorphs ut if this all how do we account for forms like sang? it would appear to contain an allomorph of past tense since it is a parallel formation with regular past tense forms:

yesteyday we parted
yesterday we laughed
yesterday we played
yesterday we sang 

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