Learn Turkish: O sinsi çocuk şimdi bizi gözetleyecektir. - That sneaky boy is probably watching us right now.

In this sentence, the future tense suffix -ecek combines with -tir to express a strong assumption rather than an actual future event. It translates closer to "must be watching" or "is probably watching." Because it describes an assumption about an action happening right this moment, it pairs perfectly with şimdi.

I learned that the -tir suffix is for stating objective facts. Why does it mean "probably" here?

You are thinking of the -dir/-tir suffix used in formal writing, signs, and definitions to state hard facts. However, when added to certain verb tenses (like the future -ecek or the reported past -miş) in everyday Turkish, it acts as a marker of deduction. It shows the speaker is making a strong, logical guess, meaning "I bet that..." or "I safely assume that..."

What is the difference between gözetlemek and izlemek?

İzlemek is the neutral verb for "to watch" (like watching a movie, a game, or someone's general movements). Gözetlemek specifically means "to spy on," "to peep," or "to secretly keep under surveillance." It is the exact right verb to describe the actions of a sinsi (sneaky) person.

Why does the pronoun take the accusative case (bizi) instead of the dative case (bize)?