THE PRONUNCIATION OF -ED ENDING IN ENGLISH VERBS

We all know, teachers and students, how difficult the pronunciation of regular past simple is.
-ed ending
The past simple tense and past participle of all regular verbs end in -ed.
For example:
base form past simple past participle
work worked worked

In addition, many adjectives are made from the past participle and so end in -ed.
For example:
I like painted furniture.

The question is: How do we pronounce the -ed?

The answer is: In 3 ways - / Id/ or / t/ or / d/

If the base verb ends in one of these sounds /t/, /d/
unvoiced /t/
for example : want wanted / Id/
voiced /d/
for example : end ended /Id/
If the base verb end in an unvoiced sound /t/
for example
/p/ hope hoped
/f/ laugh laughed
/s/ fax faxed
/S/ wash washed
/tS/ watch watched
/k/ like liked

If the verb ends in a voiced sound /d/
for example
vowels play played
/r/return returned
/g/beg begged
/l/ travelled
/m/ dreamed

It is important to notice that it is the sound that is important, not the letter or spelling. For example, "fax" ends in the letter "x" but the sound /s/; "like" ends in the letter "e" but the sound /k/.

Exceptions
The following -ed words used as adjectives are pronounced with /Id/:
aged, blessed, crooked, dogged, learned, naked, ragged, wicked, wretched.

To practise the pronunciation you can click on the following links:

http://eslus.com/LESSONS/PRONUNCI/EDENDING/ED1.HTM

http://www.english-zone.com/convo/pron-ed1.html

http://www.shertonenglish.com/resources/es/pronunciation/pronunciation-ed.php

http://www.elearnenglishlanguage.com/esl/grammar/simplepast-pronunciation.html

http://www.englisch-hilfen.de/en/exercises/pronunciation1/index.php

http://www.carmenlu.com/third/listening/pronunciation/pastregular3_1.htm