
Since Yaf`a'lu means 'you are doing', it's the default word to refer to one man. All of Arabic begins with the singular (1) and masculine (Mudhakkar) forms. All of Arabic is therefore based on gender and an amount/number, so that you know who you talking to (human/sentient) or how many things (objects/non-sentient) you are talking about. But what if you are referring to 2 women, or the Qur'an is talking a group of masculine objects?...