Examples of using "Katılmayacağını" in a sentence and their english translations:
I don't know whether he'll join us or not.
Ask Tom if he'll attend the meeting.
Tom thought that Mary was probably not going to attend the event.
What puzzled us was that he said he would not attend the meeting.
I think I'll go ahead and ask Tom if he'll join us.
Ask him if he will attend the meeting.