Questions & Answers about Bu çiçekler güneşte kalınca soluyor.
Bu itself can mean this or these. Turkish does not change the form of bu for singular vs. plural.
You understand it as these here because the noun çiçekler is plural:
- bu çiçek = this flower
- bu çiçekler = these flowers
So the plurality is shown by the noun, not by bu.
The ending -ler / -lar is the regular Turkish plural suffix.
Here:
- çiçek = flower
- çiçekler = flowers
It appears as -ler rather than -lar because of vowel harmony. The last vowel in çiçek is e, so the front-vowel version -ler is used.
The ending -de / -da / -te / -ta is the locative suffix, often meaning in, on, or at.
So:
- güneş = sun
- güneşte = in the sun / under the sun / in sunlight
Here it expresses the place or condition where the flowers are left.
The form is -te rather than -de because ş is a voiceless consonant, and Turkish often changes d to t after voiceless consonants.