Questions & Answers about Ben kahvaltıda çay içmeden güne başlayamıyorum.
Usually, no. The verb başlayamıyorum already ends in -um, which tells you the subject is I.
So Kahvaltıda çay içmeden güne başlayamıyorum is perfectly natural. Adding Ben gives emphasis or contrast, like As for me, I can't start the day without drinking tea at breakfast.
Kahvaltı means breakfast. The ending -da is the locative suffix, which often means in / at / on.
So kahvaltıda means at breakfast or during breakfast. In this sentence, it tells you the time/context in which the tea drinking happens.
Because çay here is being used in a general, non-specific way: tea as a habit, not one specific tea.
- çay = tea, tea in general
- bir çay = a tea, one tea, one cup of tea
- çayı = the tea, or a specific tea already known from context
In this sentence, the speaker means drinking tea in general, so plain çay is the most natural choice.