Learn Portuguese (Portugal): Estes pássaros azuis são tão bonitos como as flores. - These blue birds are as beautiful as the flowers.

Tão... como is the Portuguese way to say 'as... as' when comparing things. Here, you put the adjective bonitos (beautiful) between them to say the birds are 'as beautiful as' the flowers.

The sentence ends with as flores (the flowers), which is feminine. Why is the adjective bonitos and not bonitas?

The adjective bonitos describes the subject of the sentence, Estes pássaros azuis (These blue birds), which is masculine plural. It does not change to match the flowers, even though they are compared at the end.

Why is the plural of azul (blue) written as azuis?

In Portuguese, words that end in the letter -l usually drop the -l and add -is to become plural. So, azul becomes azuis.

Why does azuis come after pássaros?

In Portuguese, descriptive adjectives like colors almost always come directly after the noun they describe. So instead of saying 'blue birds', you say pássaros azuis.