Speak English Professionally: -ed and -s endings

VOICED & VOICELESS
Sounds with vocal chord vibration are voiced and sounds without vocal chord vibration are voiceless.

Contrast the sounds of the letters v and f. Place your fingers on your throat and make the sounds. You should feel a vibration when you make the v sound and no vibration when you make the f sound. V is voiced and f is voiceless.

• The Voiced Sounds in English

b d g j l m n ŋ(ng) r v z ð(th in the) and all vowels

• The Voiceless Sounds in English

ch f h k p s sh t θ(th in think)

Ref: eflnet.com



-ED ENDINGS

• /id/ after /t/ or /d/

invited
educated
waited
landed
handed
located
predicted

• /t/ after voiceless sounds

laughed
locked
looked
finished
crashed
picked
embarrassed

• /d/ after voiced sounds

worried
called
turned
prepared
rearranged
played

-S ENDINGS

• /s/ after voiceless sounds (except /s/, /ʃ/, /ʧ/)

compliments
hopes
meets
laughs
months
writes
parents

• /z/ after voiced sounds (except /z/, /ʒ/, /ʤ/)

clothes  (th - ð)
magazines
saves
feels
drives
friends
feathers

• /iz/ 

raises
horses
finishes
changes
rises
taxes
washes
dishes
kisses


Source: 

• Coursera 
• Coursera