my site is multilanguage and i want to add Q & A in both

my site is multilanguage and i want to add Q & A in both languages
no problems in my mail language en
in my second language ar i can find list questions page but ask page gives me not found
and my language switcher does not seem to know where to go
main language :
http://www.smacrs.com/Dir/questions
http://www.smacrs.com/Dir/questions/ask

see language switcher goes right in questions list but not in ask question
http://www.smacrs.com/Dir/ar/questions

i tried
http://www.smacrs.com/Dir/ar/questions/ask

but with no luck

i use polylang plugin for language management
please help me to reach add question page and link to language switcher