The volitive conveys the speaker's attitude of hope, wish, or fear concerning the proposition expressed by the utterance.
The verbal construction "finite proposition DEB O'YLA-", in addition to its first meaning expressing assumption ('to think that',
cf. belief verbs with epistemic modality), may also express the hope of the person referred to by the subject of the main sentence,
the sentence headed by the verb o'yla- ('to think'), that the finite proposition will come true.
Men muvaffaqiyat qozonaman deb o'ylayman.
I hope I will succeed.
U keladi deb o'ylayman.
I hope he will come.
A variant with the same meaning is the construction "finite proposition DEB UMID QIL-"
Siz kelasiz deb umid qilaman.
I hope you will come.
The verb tila- (with the infinitive in -ISH at the accusative) is used to express a wish.
Men hammasi yaxshi bo'lishini tilayman.
I wish that everything will be OK.
Men sizga omad tilayman.
I wish you good luck.