Questions & Answers about Yeni tur saat üçte bitecek.
How is the future tense built in the word bitecek?
The verb root is bit- (to end or finish). Since it ends in a consonant, we don't need the buffer letter y that we use for vowel-ending roots. We simply add the future suffix. Because the vowel in bit- is i (a front vowel), vowel harmony rules tell us to use -ecek instead of -acak.
Why does 'at three' use -te in üçte instead of the usual -de for 'at'?
The word üç (three) ends in ç, which is a hard consonant. When you add a suffix that usually starts with d (like the locative suffix -de meaning 'at') to a hard consonant, the d mutates to a t so it is easier to pronounce. This is the 'Fıstıkçı Şahap' rule you learned earlier. That is why we get üçte instead of üçde.
Do we always need the word saat before the number when talking about time?
In English we put 'o'clock' after the number, but in Turkish you put saat (hour or clock) before the number. Saying saat üçte makes it perfectly clear you mean 'at three o'clock'. Without saat, üçte could just mean 'at three' or 'in three', though people would probably still guess what you meant from the context of a tour ending.
Why is there no personal ending on the verb bitecek?