Suffix -ED
One of the hardest things for students to remember is how to properly pronounce the -ed at the end of verbs and some adjectives.

This short exercise is to help students recognise the ed. You can expand on this with a list of your own words.
Guide
Give the sheet to your English Language student and read out the rules. Ask them to pronounce the words on the page. Each column contains a list of words with the same suffix sound but don't tell them that.

Correct the words that they say incorrectly, straight away. Make sure they repeat them correctly. Circle the words they didn't pronounce correctly, and go back over them. 

Most advanced students pick this up quickly but beginners are usually surprised that ed is pronounced differently with different words.
A short exercise about the suffix –ed and how to pronounce it.

There are three main rules that you need to know.

1. If you add –ed to a word that ends with a t or d sound, then ed sounds like ‘ed’ and is pronounced as an extra syllable. For example: faintED

2. If you add –ed to a word that ends with voiceless consonant sounds – c, ch, f, gh, k, ks, p, s, sh, t...etc– then the -ed sound sounds like ‘t’ and is not pronounced as an extra syllable. For example: forced – pronounced ‘forst’

3. If you add –ed to any other word that does not fit the above rules and has these voiced consonant sounds, or with a vowel, – b, d, g, j, l, m, n, ng, r, th, v, z...etc, the –ed is pronounced with a ‘d’ sound, no extra syllable. For example: waved is pronounced 'wayvd'.

Pronounce these words aloud:

clotted
doted
exited
faded
ghosted
heeded
aided
jaded
riveted
vaulted
gilded
anticipated
tilted
protected
entrusted		 looped
moped
collapsed
rehearsed
grasped
glanced
seeped
trapped
gripped
focused
increased
resurfaced
looked
faked
locked		 renowned
staggered
crawled
scanned
sealed
stared
aimed
levelled
realised
rolled
framed
pictured
summoned
fumbled
crumpled

To practice pronouncing your –ed suffix sounds, we recommend reading aloud The Da Vinci Code by Dan Brown. 

There are some exceptions to this rule to separate a verb from an adjective. Here are two of them.
EG. Blessed can be pronounced blest (verb) and blessED (adjective).
Learned can be pronounced lernd (verb) and lernED (adjective).

http://www.speakoz.com/english-directory/lesson-plans/ed.html
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