The hardest part of Tohono O'odham is the plurals of nouns and verbs. It seems that most are formed by reduplicating the first syllable of the word, sometimes with the loss of a vowel, but that is not always the case. Don't forget that all words must start with a consonant, so if there's a vowel first, a glottal stop is implied before it.
Their meanings are child, boy, working, girl, and crying respectively.
Although I have posted some sentences around the forum, I have yet to really complete a lesson, so when I do that I'll start posting more here.