"My mom likes monkeys."
Translation:Shimá magí bił yáʼátʼééh.
Yáʼátʼééh! Please, do not use the vertical apostrophe / ' / in the Navajo translation. I think you can leave a space instead. This sentence would accept / ya at eeh / or / yá át ééh / (marking a typo, instead of a wrong answer) as in other exercise. The apostrophe used in Navajo is called right closing single quotation or smart single quotation. I think it can be type it as Alt+0146, on Windows. But I cannot assure it because I am only using the Navajo fonts with Multiling Keyboard for Android.
I hope it helps. :)