Learn Turkish: İyi ki yağmur yağar diye tedarikli geldik. - Good thing we came prepared in case it rains.

The word diye literally means "saying" or "thinking." When combined with the aorist tense, as in yağar (it rains), it forms a precautionary clause. You are essentially saying "we came prepared thinking that it might rain." In English, we naturally translate this as "in case it rains."

The current lesson mentions using both the aorist and the conditional with diye. Could we say yağmur yağarsa diye here instead?

Yes, absolutely! Yağmur yağarsa diye is also perfectly correct and very common. Both versions translate to "in case it rains." The aorist version (yağar diye) frames it as a general possibility, while the conditional version (yağarsa diye) frames it slightly more as an "if" scenario, but in everyday speech they are used interchangeably for precautions.

Why is the aorist tense (yağar) used when the main action happened in the past (geldik)?

Clauses with diye always preserve the original "internal quote" or thought process at the exact moment it occurred. At the time we were getting ready to leave, the thought was "It might rain" (Yağmur yağar). We keep that present-focused aorist tense inside the diye clause, even though the main verb (geldik) is in the past.

What is the structure of the word tedarikli?