An example in Finnish:
- jousta (normal form of the verb run)
- juoksen (I run)
- juoksentelen (I run around)
- juoksentelisinkohan (I wonder should I run around)
- juostaankohammekohaan (I wonder do we run)
The two later forms are very rarely used, and I have no idea whether the last form is even correct. I have some friends who insist on talking like this. Usually, people express the same things with more words, such as juoksentelisinkohan is equivalent to about:
- Mietin ., että. pitäisikö. minun. juosta. ympäriinsä.
- I wonder., that. should. my (in this context, me). run. around.
The . are to separate the words.
Yet, it would be perfectly fine to just append a question mark to juoksentelisinkohan or juostaankohammekohaan and it would be a one-word sentence. An interesting remark is that in practice the question mark is redundant in both cases, as the -ko- part in the words reduces the only interpretation of the word to be a question.
I have absolutely no idea how would one formalize all this.