-ed suffix
The  morpheme  -ed  of  the  past  tense  (or  past  participle)  is  also  pronounced  in  three
different ways depending on the preceding consonant:
ɪd     after t and d    
painted    /peɪntɪd/  founded    /fɑʊndɪd/
wanted    /wɒntɪd/  rounded    /rɑʊndɪd/
t     after unvoiced consonants: /f/ /k/ /p/ /s/  tʃ   /ʃ     
clapped    /klæpt/  brushed    /brʌʃt/
laughed  /lɑːft/    wished    /wɪʃt/
d      in other cases      
earned    /ɜːnd/    carried    /kær ɪd/
changed  /tʃeɪndʒd/  harmed    /hɑːmd/ 
13
Exercise 17 Pronounce the past form of these regular verbs paying attention to the  –ed
suffix.
1. study  _____
2. judge  _____
3. listen  _____
4. miss  _____
5. work  _____
6. answer  _____
7. test  _____
8. invent  _____
9. research  _____
10. enjoy  _____