"He likes this shirt because it is blue."

Translation: Ele gosta desta camisa porque é azul.

[Chappie]

How do they figure it is "desta" not "deste or este/esta?"

[badseed55]

Because camisa is feminine. Desta camisa/ deste vestido

[Prancytime]

Should pois work here in place of porque?

[Vitor_S20]

Yes but is less common in spoken discourse.

[Junesun]

This exact sentence came up 5 times so far in this lesson...

[Prancytime]

He really likes his blue shirt.

[KatiaAldan]

Why can't I write "esta" instead of desta?

[Paulenrique]

You should use "de" after gostar. De + esta = desta.