Pronounce words that end in "-ed"

How to Pronounce -ed in English

90% of my students battle a bit with this!
not to stress though because this is very simple to correct.
I always tell them to imagine there is no "e" in the ed!
the "e" is some what Silent

The past simple tense and past participle of all regular verbs end in -ed. For example:

base verb (v1)	past simple (v2)	past participle (v3)
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:		example base verb*:	example with -ed:	pronounce the -ed:	extra syllable?
unvoiced	/t/	want	wanted	/ Id/	yes
voiced	/d/	end	ended
unvoiced	/p/	hope	hoped	/ t/	no
	/f/	laugh	laughed
	/s/	fax	faxed
	/S/	wash	washed
	/tS/	watch	watched
	/k/	like	liked
voiced	all other sounds, for example...	play	played	/ d/
		allow	allowed
		beg	begged

* note 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

So we say:

• an aged man /Id/
• a blessed nuisance /Id/
• a dogged persistance /Id/
• a learned professor - the professor, who was truly learned /Id/
• a wretched beggar - the beggar was wretched /Id/

But when used as real verbs (past simple and past participle), the normal rules apply and we say:

• he aged quickly /d/
• he blessed me /t/
• they dogged him /d/
• he has learned well /d/ or /t/\

here are some more examples of the ed sounds of  "d","t" and "id"

sounds like: /t/ at the end
Asked                                     
Knocked
Faxed
Booked
Helped
Stopped
typed

sounds like: /d/ at the end
Considered
Answered
Explained
Fired
Studied
Called
Organized
Interviewed

sounds like:  /id/ at the end
Folded
Decided
Operated
Marketed
Visited
Relocated
Completed
Demanded
Counted
Attended

Dustin reccomends www.howjsay.com to help you with any pronuncation problems you are having!

source: http://www.englishclub.com/pronunciation/-ed.htm