Keep expecting.. It also could be written as this:

Gallia valisi onu durdurmaya çalışsa da başaramadı.*

*( I prefere başaramadı to yenilgiye uğradı in this sentence)      

For expressing real conditions in verbal clauses V + AOR + -se… is used:

Acele et|mez|se|n, treni kaçıracağız. ‘If you don’t hurry…’

When the condition is unreal, se is attached straight to the verb stem V + -se…:

Erken yat|sa|ydı|n, yorgun olmayacaktın. ‘If you slept early…’

Wishes are spoken out with the same formula. 

The above rule has been explained in a hundred threads before. But I still want to make sure how it works in existential (var/yok) and nominal (‘to be’/değil) sentences.

I choose as simple examples as possible:

In other words, when the condition is unreal the verb ol- is called for help.

Have I understood this correct? Are the translations in the table as they should be?