Why are some plurals -er and some -ar? Any rules?
Short explanation: Plural of one-syllable words can take either -ar or -er, usually the former. For a more detailed explanation, see the tips and notes for the Plurals lesson in the web version.
To have the same answer, one capped, one not, is useless. Give us challenges in the choices
The alternative answers in the multiple choice questions are automatically generated by Duo, the course creators have no influence over it. If you want Duo to change this, you should bring it up in the general forums instead.
How do you say "the horses"?