Can someone from, say, Morocco understand a fellow Arabic speaker from Iraq?
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No they can't, it's really different. The language of communication is Classical Arabic, but then you need to go to school and study to learn it.
Between morocco and egypt, their Arab are not so different, but not between Dubai and morocco .
You can speak french in Algeria, Morocco and Tunisia but you will need Arab too.
So french and classical arabic are good choices, with english of course.
____________________
No they can't, it's really different. The language of communication is Classical Arabic, but then you need to go to school and study to learn it.
Between morocco and egypt, their Arab are not so different, but not between Dubai and morocco .
You can speak french in Algeria, Morocco and Tunisia but you will need Arab too.
So french and classical arabic are good choices, with english of course.