There are three ways to pronounce 'ed', depending on the sound which comes before it. The three ways are: /id/ for words ending in 't' or 'd' eg wanted, needed /t/ for words ending in s,z,ch,sh,k,p eg watched, looked /d/ for all other words

I understand what you mean now I think. Words ending with these letters "x - p - s - k - sh - ch - c" will make a "T" sound at the end of the word. For Example "faced" is pronounced as "fayst". Words ending in the other letters will make a "D" sound.

The ending "-ed" usually signals the past tense. If a word already ends with a T or a D sound, the you must pronounce the '-ed' as a separate syllable as in wanted, needed, heeded, folded, taunted, etc. Words that do not already end in a T or D sound simply have that sound added on rather than adding on the entire -ed sound as a syllable. Su.Ki. gave a good explanation: /id/ for words ending in 't' or 'd' eg wanted, needed /t/ for words ending in s,z,ch,sh,k,p eg watched, looked /d/ for all other words

google translate can provide clear spoken words

do you have any examples?