The conjunction as has several different meanings. We use as when a person party transpires though An additional is in development (‘over the time that’). In cases like this the verb just after is frequently in the continuous form: 3 playing cards from a Visconti-Sforza tarot deck: Ace of cups, https://tarotista-gratis08528.canariblogs.com/as-things-to-know-before-you-buy-43370510