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Questions & Answers about Somos gémeos idênticos.
Could we use os mesmos (the same) here instead of idênticos, since this lesson is about o mesmo?
Not in this context. Idênticos means identical in appearance or biology. If you said Somos os mesmos gémeos, it would mean 'We are the very same twins (that you saw earlier)', not 'We are identical twins'.
The sentence says gémeos idênticos. What if the twins are two women?
Why is the adjective idênticos placed after the noun gémeos?
In Portuguese, adjectives that describe a physical trait or classify a noun usually come directly after it. Since idênticos describes the specific type of twins, it must follow gémeos.