Duo rejected "great," but I think that in English fears are usually great, not strong.
Can we usr Av instead of for att
No, that'd make no sense.
Can you explain why, please?
I'm not really sure how. Swedish doesn't use av here. There's no reason beyond "that's how the preposition evolved".
Someone call Erica Jong!
'My fear of flying is considerable' sounds better than strong, but really we would be much more likely to express it more actively eg 'I am terrified of flying'.
I am not afraid of flying. I am afraid of crashing.
Why is 'My fear to fly is strong' wrong?
Added that now. :)
"rädsla att flyga" is wrong?
Yes, that makes no sense in Swedish.