Masculine and feminine

A masculine word can be changed to a feminine word by changing the last huruf of the word. There are three ways to do this:

1. Masculine: طَالِبٌ Taalibun. A male student.
   Feminine: Add ةٌ at the last huruf to become طَالِبَةٌ Taalibatun. A female student.
2. Masculine: أَيسَرُ aisaru. Left.
   Feminine: Add a ئ at the last huruf to become يُسرَئ yusraa. Left.
3. Masculine: حَسَنٌ Hasanun. Noble man.
   Feminine: Add اء at the last huruf to become حَسنَاءُ Hasna'u. Noble woman.

Note that for number 2 it is not really a ئ but it should be a أَلِفٌ مَقصُورَةٌ. I, however, can't find أَلِفٌ مَقصُورَةٌ on the keyboard :(