Practice worksheet for learning prefixes and suffixes to form correct words in context.

Let’s go through each sentence one by one. We’ll look at the word in brackets and decide whether to add a prefix (like “un-” or “dis-”) or a suffix (like “-ful”, “-ous”, “-er”, etc.) to make it fit the sentence correctly.

We want the new word to make sense in the sentence — grammatically and logically.

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1. I can’t answer this question. It’s __________ (POSSIBLE).
→ If you *can’t* answer, it means it’s not possible → use prefix “im-” → impossible

2. Don’t stand near the water. It’s too __________ (DANGER).
→ We need an adjective describing the water → add suffix “-ous” → dangerous

3. I don’t like this fish. It’s not very well __________ (COOK).
→ This is about how the fish was prepared → past participle needed → add “-ed” → cooked

4. Kate started crying because she was so __________ (HAPPY)
→ Crying usually means sadness → opposite of happy → use prefix “un-” → unhappy

5. If you have a haircut it will change your __________ (APPEAR)
→ We need a noun meaning “how you look” → add suffix “-ance” → appearance

6. Paul never waits in queues. He is too __________ (PATIENT)
→ Not waiting = not patient → use prefix “im-” → impatient

7. Thank you for your advice. You have been very __________ (HELP).
→ Describing someone who gives help → add suffix “-ful” → helpful

8. Stealing other people's money is __________ (HONEST)
→ Stealing is wrong → not honest → use prefix “dis-” → dishonest

9. Our science __________ is very young. (TEACH)
→ Refers to the person who teaches → add suffix “-er” → teacher

10. Harry didn't think the book was very __________ (INTEREST).
→ He wasn’t interested → we describe the book as causing interest → add “-ing” → interesting

11. A million pounds was given to the hospital by an __________ person (KNOWN)
→ Someone not famous or recognized → use prefix “un-” → unknown

12. When you __________ this paragraph, make it a bit shorter (WRITE)
→ You’re doing the action again → use prefix “re-” → rewrite

13. Mary was wearing a/an __________ hat (USUAL)
→ Probably something strange or different → use prefix “un-” → unusual

14. That was a great film. It was really __________ (ENJOY)
→ The film caused enjoyment → add “-able” → enjoyable

15. I like this town. The people are very __________ (FRIEND)
→ People who act friendly → add “-ly” → friendly

16. I don't think you're right. I __________ with you completely (AGREE)
→ You disagree → use prefix “dis-” → disagree

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Final Answer:
1. impossible
2. dangerous
3. cooked
4. unhappy
5. appearance
6. impatient
7. helpful
8. dishonest
9. teacher
10. interesting
11. unknown
12. rewrite
13. unusual
14. enjoyable
15. friendly
16. disagree