Learn Turkish: Bu takım turnuvayı kazanacak mı? - Will this team win the tournament?

We add the future tense suffix -acak to the verb root kazan- (to win). Then we add the separate question particle mı. Since the last vowel in kazanacak is a, the question particle takes the form mı to match it according to 4-way vowel harmony.

Why is there a -yı at the end of turnuvayı?

Because it is the specific direct object of the sentence (meaning 'the tournament' rather than just 'a tournament'). This requires the accusative case. Since turnuva ends in a vowel, we need the buffer letter -y- before adding the accusative suffix -ı.

Why doesn't Bu takım take any suffixes here?

Bu takım (this team) is the subject doing the action, so it stays in its base dictionary form. Case endings like the accusative are only used for objects, not subjects.

Will the question particle always be written separately for the future tense?

Yes! The question particle (mı, mi, mu, or mü) is always written as a separate word. If we had a personal pronoun like 'I' or 'we', the personal suffix would attach directly to the question particle, such as in kazanacak mıyım? (Will I win?). Since 'this team' acts as a third-person 'it', no personal suffix is needed here.