##  [English plurals: Exceptions to the rules!](/en/quiz/english-plurals-exceptions-to-the-rules-eng)

No language can thrive without having a way for its speakers to express things in the plural; for example, two desserts are always better than one!

As you may know, most English nouns form their plurals by adding **s** or **es**. But a simple rule with no exceptions would be boring! So why not test your knowledge by choosing the correct irregular plurals for the words below.

1. The plural of **piano** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).pianoes

pianoses

pianos

2. The plural of **fraternity** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).fraternitys

fraternities

fraternity’s

3. The standard plural of **caribou** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).caribou

cariboux

caribous

4. The recommended plural of **phenomenon** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).phenomena

phenomeni

phenomenons

5. The standard plural of **surplus** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).surplusses

surpli

surpluses

6. The plural of **kibbutz** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).kibbutzes

kibbutzim

kibbutza

7. The standard plural of **brother-in-law** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).brother-in-laws

brothers-in-laws

brothers-in-law

8. The plural of **crisis** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).crises

crisises

crisae

9. The plural of **photo** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).photos

photoes

photoses

10. The plural of **species** is ![Placeholder for the answer](/sites/default/files/underscore_15_black-wet.gif).specises

speci

species