As.... As se utilliza para comparar con cualquier adjetivo
Ej:
Danny is as clever as Jane.
Danny es tan inteligente como Jane
The pen is as small as the ruler.
La lapicera es tan chica como la regla
Tambien se puede utlizar como Mientras
"I will go as long as it is free."
Ire mientras sea gratis
"You can borrow my bike as long as you are careful."
Podes tener mi bicicleta mientras seas cuidadoso