Missing tenses and words
Most of the verb + if's (if I have done - yapmışsam, yemişsem (if I have eaten... etc...) are missing. Turkish is difficult to deal with because of this particular suffixing, still maybe it may be integrated into code as an algorithm? In my opinion, more than the prediction of the next word, SwiftKey currently needs larger Turkish vocabulary. Specifically including words with prepositions and conjugations.
Absolutely many conjugations, including tense and person, and many declensions to nouns are missing. The Turkish grammar/vocabulary needs to be expanded.