Crase

The crase is optional
After até, before feminine possessive pronouns
Before the word dona, before feminine proper names

The crase is forbidden
Before repeated masculine words
Indefinite feminine article
Personal pronouns and verbs

The crase is forbidden
Before the words casa and terra
When the sense is the own home
And the own ground

It's craseado a moda de, even if hidden
It's craseado the a, when replaced by ao

I go to, I come back from
Crase in the a
I go to, I come back from
Why use crase?