Turkish basic course

-ecek olursa
If we add the suffix -ecek to any verb root we create a form which implies expected or planned action or state; something as yet to take place. However, when olursa (olursam, olursan, etc) is added to –ecek, the implication is that the anticipated action is not customary or is not the rule.
İstanbul’a gittiğin zaman müzeye gidecek olursan bana bir kitap alır mısın?

When you’re in Istanbul, if you happen to go to the museum, will you get me a book?
Şayet sana verdiğim adresi kaybedecek olursan, hemen bana telefon et.

If you should happen to lose the address I gave you, phone me right away.
Often şayet, eğer, tesadüfen is added before the clause having -ecek olursa. In this way, shades of meaning are obtained.