72. The Plural Vocatives أيـُّها and أيـَّتـُها
You have already been introduced to the vocative يا , which is used with singular nouns and, therefore, could be followed by a proper noun, a title, or an Idaafa, regardless of the gender.
**يا سميرُ! ، يا أستاذةُ! ، يا مَديرَ المکتـَبِ!**
The plural forms show gender distinction and, therefore, Arabic has أيـُّها for the masculine and أيـَّتـُها for the feminine. The plural vocative should be followed by a noun with the definite article in the nominative case.
**أيُّها الطلاَّبُ! أيَّتـُها الطالباتُ! **