Learn Turkish: Biri kaybolacak diye çadıra fişek koyduk. - We put a flare in the tent in case someone gets lost.

While diye literally means "saying", it is frequently used in Turkish to express intention, purpose, or a reason based on an internal thought. Here, Biri kaybolacak diye translates conceptually to "thinking someone will get lost." In English, we express this naturally as "in case someone gets lost."

Why is kaybolacak in the future tense when the English translation uses the present tense "gets lost"?

When using diye to express "in case", Turkish uses the future tense (-acak/-ecek) because the feared or expected event hasn't happened yet. You are taking action now because you think "someone will get lost." English grammar uses the present tense after "in case", but Turkish stays strictly true to the timeline of the potential event.

The translation says "in the tent", so why does the Turkish use çadıra (to the tent) instead of the locative çadırda (in the tent)?

The verb koymak (to put) describes the movement of placing an object into a location, rather than its static resting position. Because it implies a direction of action, koymak always takes the dative case (-(y)a/-(y)e). You are putting the flare into or towards the tent.

How exactly is the word kaybolacak formed?