PrefixesandSuffixes (Exercise) Answers | PDF | Cognition - Free Printable
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Step-by-step solution for: PrefixesandSuffixes (Exercise) Answers | PDF | Cognition
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Show Answer Key & Explanations
Step-by-step solution for: PrefixesandSuffixes (Exercise) Answers | PDF | Cognition
You’ve uploaded a “Prefixes & Suffixes Worksheet – Exercise” where you’re asked to transform the word in brackets into its correct form using prefixes and/or suffixes. Let’s go through each question one by one, explain the reasoning, and provide the correct answer.
---
1. He was sitting ___comfortably___ in his seat on the train. (comfort)
✔ Correct answer: comfortably
→ *Comfort* is a noun. To describe *how* he was sitting (an adverb), we add the suffix -ly → comfortably.
---
2. There was a ___green___ light coming from the window. (green)
✔ Correct answer: green
→ The word *green* is already an adjective describing the *light*. No change needed. Sometimes no prefix/suffix is required — this is one of those cases.
---
3. He was acting in a very ___childish___ way. (child)
✔ Correct answer: childish
→ *Child* + suffix -ish = childish (meaning immature or like a child).
---
4. This word is very difficult to spell, and even worse, it's ___mispronounced___. (pronounced)
✔ Correct answer: mispronounced
→ *Pronounced* is the past participle of “pronounce.” Adding the prefix mis- (meaning wrongly) gives mispronounced — meaning pronounced incorrectly.
---
5. He's lost his book again. I don't know where he has ___placed___ it this time. (place)
✔ Correct answer: placed
→ *Place* is a verb. In present perfect tense (“has ___”), we need the past participle → placed.
---
6. You shouldn't have done that! It was very ___unthinkable___ of you. (think)
✔ Correct answer: unthinkable
→ *Think* → add prefix un- (not) + suffix -able → unthinkable (meaning not able to be thought of; shocking).
---
7. He didn't pass his exam. He was ___unsuccessful___ for the second time. (succeed)
✔ Correct answer: unsuccessful
→ *Succeed* → root is *success*. Add prefix un- → unsuccessful (not successful). Note: “succeed” becomes “success” first, then “unsuccessful”.
---
8. Some of the shanty towns are dreadfully ___crowded___. (crowd)
✔ Correct answer: crowded
→ *Crowd* → add suffix -ed to make adjective → crowded (full of people).
---
9. The team that he supported were able to win the ___championship___. (champion)
✔ Correct answer: championship
→ *Champion* → add suffix -ship → championship (the title or competition won by a champion).
---
10. There is a very high ___likelihood___ that they will be late. (likely)
✔ Correct answer: likelihood
→ *Likely* → add suffix -hood → likelihood (the state or quality of being likely).
⚠️ *Note:* Your worksheet says “likely”, but the correct answer should be likelihood. If you wrote “likely”, it’s incorrect — it should be a noun here.
---
11. I couldn't find any ___weakness___ in his theory. (weak)
✔ Correct answer: weakness
→ *Weak* → add suffix -ness → weakness (the state of being weak).
---
12. He wants to be a ___mathematician___ when he grows up. (mathematics)
✔ Correct answer: mathematician
→ *Mathematics* → remove “s” and add suffix -ian → mathematician (a person who studies math).
---
13. You need to be a highly trained ___economist___ to understand this report. (economy)
✔ Correct answer: economist
→ *Economy* → add suffix -ist → economist (a person who studies economics).
---
14. There were only a ___handful___ of people at the match. (hand)
✔ Correct answer: handful
→ *Hand* + suffix -ful = handful (a small number; literally, what fits in one hand).
---
15. She arrived late at work because she had ___been sleeping___. (sleep)
✔ Correct answer: been sleeping
→ Past perfect continuous tense: “had been ___ing”. So, *sleep* → sleeping, and with “had been” → been sleeping.
---
16. The road was too narrow, so they had to ___widen___ it. (wide)
✔ Correct answer: widen
→ *Wide* → add suffix -en → widen (to make wider).
---
17. He was accused of ___falsifying___ documents. (false)
✔ Correct answer: falsifying
→ *False* → verb form is *falsify* → add -ing for gerund after “of” → falsifying.
---
18. They had to ___tranquilise___ the lion before they could catch it. (tranquil)
✔ Correct answer: tranquilise *(or "tranquilize" in American English)*
→ *Tranquil* → add suffix -ise → tranquilise (to make calm).
---
19. He needed to ___regulate___ the temperature. (regular)
✔ Correct answer: regulate
→ *Regular* → verb form is regulate (to control or adjust). Remove “ar” and add “ate”.
---
20. I think that you should ___consider___. It may not be the best thing to do. (consider)
✔ Correct answer: consider
→ After modal verb “should”, use base form of verb → consider. No change needed.
---
21. There was a three-hour ___stopping___ because of the strike. (stop)
✔ Correct answer: stoppage
→ *Stop* → add suffix -age → stoppage (an interruption or halt).
⚠️ *Note:* “Stopping” is incorrect here. “Three-hour stopping” doesn’t make sense. It must be stoppage — a noun meaning a period when something stops.
---
## ✔ Final Correct Answers:
1. comfortably
2. green
3. childish
4. mispronounced
5. placed
6. unthinkable
7. unsuccessful
8. crowded
9. championship
10. likelihood *(not "likely")*
11. weakness
12. mathematician
13. economist
14. handful
15. been sleeping
16. widen
17. falsifying
18. tranquilise
19. regulate
20. consider
21. stoppage *(not "stopping")*
---
## 💡 Key Tips:
- Always check if the word needs to be a noun, verb, adjective, or adverb based on sentence structure.
- Common suffixes: -ly, -ness, -ship, -ful, -en, -ize, -ify, -age
- Common prefixes: un-, mis-, re-, pre-
- Be careful with tense and part of speech changes.
Let me know if you’d like a printable version or flashcards for these!
---
1. He was sitting ___comfortably___ in his seat on the train. (comfort)
✔ Correct answer: comfortably
→ *Comfort* is a noun. To describe *how* he was sitting (an adverb), we add the suffix -ly → comfortably.
---
2. There was a ___green___ light coming from the window. (green)
✔ Correct answer: green
→ The word *green* is already an adjective describing the *light*. No change needed. Sometimes no prefix/suffix is required — this is one of those cases.
---
3. He was acting in a very ___childish___ way. (child)
✔ Correct answer: childish
→ *Child* + suffix -ish = childish (meaning immature or like a child).
---
4. This word is very difficult to spell, and even worse, it's ___mispronounced___. (pronounced)
✔ Correct answer: mispronounced
→ *Pronounced* is the past participle of “pronounce.” Adding the prefix mis- (meaning wrongly) gives mispronounced — meaning pronounced incorrectly.
---
5. He's lost his book again. I don't know where he has ___placed___ it this time. (place)
✔ Correct answer: placed
→ *Place* is a verb. In present perfect tense (“has ___”), we need the past participle → placed.
---
6. You shouldn't have done that! It was very ___unthinkable___ of you. (think)
✔ Correct answer: unthinkable
→ *Think* → add prefix un- (not) + suffix -able → unthinkable (meaning not able to be thought of; shocking).
---
7. He didn't pass his exam. He was ___unsuccessful___ for the second time. (succeed)
✔ Correct answer: unsuccessful
→ *Succeed* → root is *success*. Add prefix un- → unsuccessful (not successful). Note: “succeed” becomes “success” first, then “unsuccessful”.
---
8. Some of the shanty towns are dreadfully ___crowded___. (crowd)
✔ Correct answer: crowded
→ *Crowd* → add suffix -ed to make adjective → crowded (full of people).
---
9. The team that he supported were able to win the ___championship___. (champion)
✔ Correct answer: championship
→ *Champion* → add suffix -ship → championship (the title or competition won by a champion).
---
10. There is a very high ___likelihood___ that they will be late. (likely)
✔ Correct answer: likelihood
→ *Likely* → add suffix -hood → likelihood (the state or quality of being likely).
⚠️ *Note:* Your worksheet says “likely”, but the correct answer should be likelihood. If you wrote “likely”, it’s incorrect — it should be a noun here.
---
11. I couldn't find any ___weakness___ in his theory. (weak)
✔ Correct answer: weakness
→ *Weak* → add suffix -ness → weakness (the state of being weak).
---
12. He wants to be a ___mathematician___ when he grows up. (mathematics)
✔ Correct answer: mathematician
→ *Mathematics* → remove “s” and add suffix -ian → mathematician (a person who studies math).
---
13. You need to be a highly trained ___economist___ to understand this report. (economy)
✔ Correct answer: economist
→ *Economy* → add suffix -ist → economist (a person who studies economics).
---
14. There were only a ___handful___ of people at the match. (hand)
✔ Correct answer: handful
→ *Hand* + suffix -ful = handful (a small number; literally, what fits in one hand).
---
15. She arrived late at work because she had ___been sleeping___. (sleep)
✔ Correct answer: been sleeping
→ Past perfect continuous tense: “had been ___ing”. So, *sleep* → sleeping, and with “had been” → been sleeping.
---
16. The road was too narrow, so they had to ___widen___ it. (wide)
✔ Correct answer: widen
→ *Wide* → add suffix -en → widen (to make wider).
---
17. He was accused of ___falsifying___ documents. (false)
✔ Correct answer: falsifying
→ *False* → verb form is *falsify* → add -ing for gerund after “of” → falsifying.
---
18. They had to ___tranquilise___ the lion before they could catch it. (tranquil)
✔ Correct answer: tranquilise *(or "tranquilize" in American English)*
→ *Tranquil* → add suffix -ise → tranquilise (to make calm).
---
19. He needed to ___regulate___ the temperature. (regular)
✔ Correct answer: regulate
→ *Regular* → verb form is regulate (to control or adjust). Remove “ar” and add “ate”.
---
20. I think that you should ___consider___. It may not be the best thing to do. (consider)
✔ Correct answer: consider
→ After modal verb “should”, use base form of verb → consider. No change needed.
---
21. There was a three-hour ___stopping___ because of the strike. (stop)
✔ Correct answer: stoppage
→ *Stop* → add suffix -age → stoppage (an interruption or halt).
⚠️ *Note:* “Stopping” is incorrect here. “Three-hour stopping” doesn’t make sense. It must be stoppage — a noun meaning a period when something stops.
---
## ✔ Final Correct Answers:
1. comfortably
2. green
3. childish
4. mispronounced
5. placed
6. unthinkable
7. unsuccessful
8. crowded
9. championship
10. likelihood *(not "likely")*
11. weakness
12. mathematician
13. economist
14. handful
15. been sleeping
16. widen
17. falsifying
18. tranquilise
19. regulate
20. consider
21. stoppage *(not "stopping")*
---
## 💡 Key Tips:
- Always check if the word needs to be a noun, verb, adjective, or adverb based on sentence structure.
- Common suffixes: -ly, -ness, -ship, -ful, -en, -ize, -ify, -age
- Common prefixes: un-, mis-, re-, pre-
- Be careful with tense and part of speech changes.
Let me know if you’d like a printable version or flashcards for these!
Parent Tip: Review the logic above to help your child master the concept of prefixes and suffixes worksheet pdf.
