English language worksheet for practicing prefix usage in sentences.

Let’s go step by step to fill in the blanks with the correct prefixes from the list:
(re, dis, im, un, mis, semi, ir)

We’ll look at each sentence and think about what meaning we need — like “not”, “again”, “wrongly”, etc. — then pick the right prefix.

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1. I ______ lock the door.
→ We often say “unlock” when opening a locked door. But here it says “I ___ lock the door.” If you’re locking it again (maybe after forgetting), you’d use re-.
✔ relock = lock again → makes sense.

2. Please ______ write this assignment.
→ If someone wrote it wrong or needs to do it again, we say “rewrite”.
✔ rewrite

3. Children usually ______ like bittergourd.
→ Most kids don’t like bitter things → so “dislike” means not like.
✔ dislike

4. Drinking water in public places may be ______ safe.
→ It might NOT be safe → so “unsafe”
✔ unsafe

5. Robin looked at the stranger with ______ trust.
→ He didn’t trust the stranger → “distrust”
✔ distrust

6. His statement is completely ______ true.
→ Not true → “untrue”
✔ untrue

7. Our company is ______ located to Tambaram.
→ Maybe moved again? Or perhaps “relocated” — yes, that’s common for moving offices.
✔ relocated

8. Raju considers himself as an ______ lucky person.
→ Not lucky → “unlucky”
✔ unlucky

9. The criminal refused to ______ close his personal information to the police.
→ Wait — “close” doesn’t fit well here. Probably meant “disclose” (to reveal). So “refused to disclose” → but the blank is before “close”. Hmm… maybe typo? Let’s assume it’s “disclose” → so prefix is dis-
✔ disclose → even though word says “close”, context suggests “disclose”

Wait — let me double-check: “refused to ___ close his info” — if it’s literally “close”, then “unclose”? No, that’s not standard. More likely, it’s supposed to be “disclose”. Since “dis” is in the list, and “disclose” fits perfectly, we’ll go with that.

✔ dis → forming “disclose”

10. Bala is a ______ honest man.
→ Not honest → “dishonest”
✔ dishonest

11. Draw a ______ circle.
→ Half-circle? That’s “semicircle”
✔ semi

12. Our boss strongly ______ agrees with this idea.
→ Doesn’t agree → “disagrees”
✔ disagrees

13. Nothing is ______ possible in our life.
→ Everything is possible → so “impossible” would mean not possible — but sentence says “Nothing is ___ possible” → which implies everything IS possible → wait, no:

Actually: “Nothing is impossible” = everything is possible → that’s a common phrase!

So: “Nothing is impossible” → because “impossible” = not possible → so “nothing is not possible” = all things are possible.

✔ im → forms “impossible”

14. Ravi is ______ kind to his mother.
→ Not kind → “unkind”
✔ unkind

15. Kavin is ______ regular to school.
→ Not regular → “irregular”
✔ irregular

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Now let’s compile the answers:

1. re
2. re
3. dis
4. un
5. dis
6. un
7. re
8. un
9. dis
10. dis
11. semi
12. dis
13. im
14. un
15. ir

Wait — let’s check #9 again. The sentence says:
“The criminal refused to ______ close his personal information to the police.”

If we put “dis” → “disclose” → that makes perfect sense: refused to disclose (reveal) his info.

Even though the word written is “close”, in context, it must be a typo or shorthand for “disclose”. In many worksheets, they write the root word and expect you to add prefix to make the correct verb.

So yes — dis is correct for #9.

Also, #13: “Nothing is ______ possible” → we want to say “everything is possible”, so we say “nothing is impossible” → so prefix is im → “impossible”

All others seem solid.

Final Answer:

1. re
2. re
3. dis
4. un
5. dis
6. un
7. re
8. un
9. dis
10. dis
11. semi
12. dis
13. im
14. un
15. ir