conditional marker; if; as if; whether.
I couldn't have dreamed of being able to arrive here.
Well and good if you charge, but our need is cash.
Fine if you want to charge your purchases, but we need cash so we don't do business on credit.
Which man asked you last night if you were still unmarried?
We had no awareness if there were a war.
We had no idea if there even was a war.
Like if the appearance of this activity is growing now inside the area.
It appears as if this activity is increasing in the area.
You can be out-of-sorts when you wake up, whether it is early or late in the day.
From a sermon in the mosque
Like whoever can take my suggestion, don't keep on doing this!