Question

what is the allomorph of coughed?

Answer 1

 Allomorph is one possible form of a particular morpheme. For example, the forms /s/, /z/ and /iz/ in cats, dogs and horses. 

The allomorph of the word 'coughed' is as shown below:

Word                  Morpheme           Allomorph      Spoken form of allomorph

Coughed             cough-ed                ed                          /t/