once upon the time.....

This is different isn't it
once a day
once a week
means
مره كل يوم ؟؟؟
مره كل أسبوع ؟؟؟
yes that`s right....

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is it right to say
twice a week
i mean shall i put a after twice like in once
yes of course ...
but it will be mean ::
you go there for two times in one week only one..