Suffix Sounds Teacher Guide
UFLI Aligned • Lesson 65
Suffix -ed: The Three Sounds
Concept: Past Tense Morphology & Phonological Rules (/t/, /d/, /ɪd/)
Teacher Guide • 30–40 Min
Lesson Objectives
- Identify suffix -ed as a morpheme signaling an action completed in the past.
- Distinguish and accurately pronounce the 3 phonological variants: /t/, /d/, and /ɪd/.
- Recognize that words ending in t or d gain an additional syllable when adding -ed.
Multisensory Cue
Have students place fingers flat against their vocal cords (throat) to feel vibration (voiced = /d/) versus breath with no buzz (unvoiced = /t/).
Step 1: Phonemic Awareness 3–4 Min
Vocal Cord Awareness Drill: Contrast voiced and unvoiced end sounds.
• "/k/ in walk: buzz or no buzz? (No buzz - unvoiced)"
• "/l/ in yell: buzz or no buzz? (Buzz - voiced)"
• "/t/ in plant: ends in /t/! (Needs an extra beat!)"
Step 2: Visual & Auditory Drill 3 Min
Flash card drill with previously taught phonograms.
Review Cards: sh, ch, th, wh, ck, ng, tch
Affix Review: -s, -es, -ing (Prompt: "What does suffix -ing mean? Happening right now!")
Introduce new suffix card: -ed
Step 3: Direct Instruction — The 3 Sounds of Suffix -ed
8–10 Min
Teach: Suffix -ed attaches to base verbs to show something already happened. Even though it is spelled -ed, our voices pronounce it 3 ways depending on the base word's final sound:
1. Extra Syllable /ɪd/ +1 Syllable
When base word ends with sound /t/ or /d/.
plant → plant-ed (2 syl)
melt → melt-ed (2 syl)
land → land-ed (2 syl)
2. Unvoiced /t/ No Vibration
When base word ends in an unvoiced sound (except /t/).
jump → jump-ed (/t/)
brush → brush-ed (/t/)
ask → ask-ed (/t/)
3. Voiced /d/ Throat Buzzes
When base word ends in a voiced sound (except /d/).
yell → yell-ed (/d/)
buzz → buzz-ed (/d/)
clean → clean-ed (/d/)
Step 4: Blending & Guided Sound Sorting
6–8 Min
Model segmenting the base word first, then blending the suffix: "b-a-k-e" → bake + /t/ = baked.
Bucket 1: /ɪd/ (Extra Syl)
rested, rented, hunted, acted, folded, drifted
Bucket 2: /t/ (Unvoiced)
helped, kicked, fished, puffed, locked, hopped
Bucket 3: /d/ (Voiced)
spilled, buzzed, grabbed, rained, sailed, filled
UFLI Foundations • Lesson 65 Instructional Routine Page 1 of 2
Lesson 65 • Continued
Application, Dictation & Differentiation
Steps 5–8: Dictation, Decodable Passage & Scaffolding Guidelines
Part 2 of Routine
Step 5: High-Frequency Words
3 Min
Review irregular and high-utility words appearing in today's decodable text:
looked
Base word look (/ʊk/) + -ed (/t/). Note the double 'oo' vowel sound.
could / would
Heart words: silent 'l'. Prompt: "C-O-U-L-D spells could!"
Check for orthographic recall without sounding out letter-by-letter.
Step 6: Dictation Teacher Script
8–10 Min
Protocol: 1. Say word/sentence → 2. Students echo & tap base word → 3. Add -ed → 4. Write & check.
Word 1: camped (/t/ sound; base word: camp)
"We camped near the lake last June."
Word 2: yelled (/d/ sound; base word: yell)
"The coach yelled with joy."
Word 3: rested (/ɪd/ sound; base word ends in /t/ → 2 syllables)
"The tired dog rested on the rug."
Sentence Dictation:
"The fox jumped and rested in the tent."
Remind students: Check capitalization, punctuation, and two past-tense verbs!
Step 7: Decodable Text Routine — "The Grand Campout"
6–8 Min
1. Pre-Reading Word Hunt
Students preview the worksheet story and highlight or underline all words ending in suffix -ed.
2. Choral / Partner Reading
Read passage together chorally for prosody, then whisper read with partner. Emphasize accurate past-tense inflections.
3. Morphological Check
Ask: "Did these actions happen now or yesterday?" Connect suffix form directly to past temporal meaning.
Step 8: Error Correction & Scaffolding Matrix
Scaffolding
Common Error: Spelling with T
Student writes "jumpt" instead of "jumped".
Prompt: "You hear /t/, but what did the person do? Jump! Jump is the base word. What suffix shows it already happened? Write -ed!"
Error: Extra Syllable on All
Student says "help-id" or "play-id".
Prompt: "Does the base word end in /t/ or /d/? No! Only 't' and 'd' words get an extra syllable. Say it fast: /helpt/, /playd/."
Extension & Multilingual
For MLs: Contrast past tense marker in English with native language time words.
Extension: Challenge students to change irregular verbs vs regular -ed verbs in sentences.
UFLI Foundations • Lesson 65 Instructional Routine Page 2 of 2
Suffix Sounds Slide Deck
UFLI Foundations • Lesson 65
Phonics & Morphology
Suffix -ed
The Three Sounds of the Past Tense
/ɪd/ /t/ /d/
Put on your detective hat: One spelling, three different sounds! Slide 1
Concept Meaning Slide 2
What does suffix -ed mean?
Adding -ed to a verb means the action already happened in the past.
Present (Right Now)
I jump
Past (Yesterday)
I jumped
Remember: The spelling is always -ed, but listen closely to how it sounds!
Rule Number 1 Slide 3
Adds an Extra Syllable!
When base words end in t or d → /ɪd/
Our mouths need an extra vowel beat to say the ending!
plant →
plant•ed
2 Syllables
melt →
melt•ed
2 Syllables
land →
land•ed
2 Syllables
Clap the beats: plant-ed (2 claps), melt-ed (2 claps)!
Rule Number 2 Slide 4
No Extra Syllable • Quiet Throat
After Unvoiced Sounds → /t/
Touch your throat! If your vocal cords don't buzz at the end, -ed sounds like /t/.
jump →
jumped
Sounds like /t/
brush →
brushed
Sounds like /t/
pack →
packed
Sounds like /t/
Watch out! We write -ed even when our ears hear /t/!
Rule Number 3 Slide 5
No Extra Syllable • Vocal Cords Buzz
After Voiced Sounds → /d/
Touch your throat! If your vocal cords vibrate, suffix -ed sounds like /d/.
play →
played
Sounds like /d/
yell →
yelled
Sounds like /d/
clean →
cleaned
Sounds like /d/
Feel the buzz in your throat on played, yelled, and cleaned!
Guided Practice Slide 6
Sound Detective: Where does each word go?
Say the base word, check your throat, and match the sound!
Suffix Detective Student Worksheet
UFLI Lesson 65
Suffix -ed Detective
Focus: Adding suffix -ed to base verbs & sorting the 3 sounds (/t/, /d/, /ɪd/)
Name:
Date:
-ed
Detective Rule: Suffix -ed means already happened in the past.
/ɪd/ after t, d /t/ unvoiced /d/ voiced
1 Part 1: Build & Classify the Sound
Write the new past-tense word, then fill in the circle for its sound.
| Base Word | Add Suffix -ed | Which sound does -ed make? |
|---|
| camp | | |
| | |
/t/ /d/ /ɪd/
|
| plant |
|
/t/ /d/ /ɪd/
|
| yell |
|
/t/ /d/ /ɪd/
|
| melt |
|
/t/ /d/ /ɪd/
|
| jump |
|
/t/ /d/ /ɪd/
|
| clean |
|
/t/ /d/ /ɪd/
|
2 Part 2: Extra Syllable Check (+1 Beat?)
Clap the beats! Does adding -ed give the word an extra syllable? Circle YES or NO.
1. twist → twisted
Ends in /t/
YES NO
2. pack → packed
Ends in /k/
YES NO
3. land → landed
Ends in /d/
YES NO
4. call → called
Ends in /l/
YES NO
UFLI Foundations • Lesson 65 Student Practice Page 1 of 2
Part 3 & 4: Application & Connected Reading
UFLI Lesson 65 • Page 2
3 Complete the Sentences (Add Suffix -ed)
Read each sentence. Change the verb in parentheses to the past tense by adding -ed.
Yesterday, Sam up the steep hill. (walk)
The little pup on the soft rug all night. (rest)
We seeds in the wet soil last week. (plant)
Dad our dog when he got lost. (call)
4 Decodable Story: The Grand Campout
Read & Find -ed Words
The Grand Campout
Directions: Read the story. Circle or highlight all words with suffix .
Suffix Detective Answer Key
Answer Key & Diagnostic Guide
Suffix -ed Detective Solutions
UFLI Lesson 65 • Comprehensive Scoring & Morphological Notes
Total Points: 20 pts
Grading Focus: Ensure students spell base word + -ed correctly (no 't' spellings) and classify by ending sound.
1 Part 1: Build & Classify the Sound (6 Points)
1 pt spelling + 1 pt sound per row
| Base Word | Add Suffix -ed | Correct Sound & Rationale |
|---|
| camp | camped | /t/ Unvoiced /p/ causes -ed to sound like /t/ |
| plant | planted | /ɪd/ Ends in 't' → creates extra syllable (/ɪd/) |
| yell | yelled | /d/ Voiced /l/ causes -ed to sound like /d/ |
| melt | melted | /ɪd/ Ends in 't' → creates extra syllable (/ɪd/) |
| jump | jumped | /t/ Unvoiced /p/ causes -ed to sound like /t/ |
| clean | cleaned | /d/ Voiced /n/ causes -ed to sound like /d/ |
2 Part 2: Extra Syllable Check Solutions (4 Points)
1. twist → twisted
Base ends in /t/ → 2 beats
YES NO
2. pack → packed
Base ends in /k/ → 1 beat
YES NO
3. land → landed
Base ends in /d/ → 2 beats
YES NO
4. call → called
Base ends in /l/ → 1 beat
YES NO
UFLI Foundations • Lesson 65 Answer Key Page 1 of 2
Part 3 & 4 Solutions & Decodable Story Master Key
UFLI Lesson 65 • Page 2
3 Sentence Completion Key (4 Points)
Yesterday, Sam walked up the steep hill. (/t/ sound)
The little pup rested on the soft rug all night. (/ɪd/ sound)
We planted seeds in the wet soil last week. (/ɪd/ sound)
Dad called our dog when he got lost. (/d/ sound)
4 Decodable Story Coded Text Key (6 Points)
Story Key: 10 Target Suffix -ed Verbs
Orange = /ɪd/ Blue = /t/ Green = /d/
Last weekend, Max and Jen camped by the big lake. When they got there, Max unpacked his sleeping bag and Jen rested on a log. Soon, the rain fell and soaked their tent! Max yelled to Jen for help.
