2. Use the clues to complete the puzzle and find the word in the shaded column: 1 can’t see it; 2 not common; 3 can’t do it; 4 not right; 5 doesn’t follow normal rules; 6 sad; 7 language used with friends.

1. invisible — can’t see it.
2. unusual — not common.
3. impossible — can’t do it.
4. incorrect — not right.
5. irregular — doesn’t follow normal rules.
6. unhappy — sad.
7. informal — language used with friends.

В выделенной колонке получается слово PREFIX.