The lesson is saying that the general rule is to take the feminine form of the adjective (ending in -a, e.g rápida, mágica, clara, ...) and add -mente, but if the adjective is the same for masculine and feminine, you just take that form, e.g feliz, legal, elegante... and add -mente to it.
rápidamente, mágicamente, claramente...
felizmente, legalmente, elegantemente... (these don't have a form for masculine and a form for feminine, they are the same, so "la mujer feliz, el hombre feliz" for example.
Hope this helps
Is there any trick to recognizing the adjectives that have the same form for masculine and feminine, without memorizing all the possibilities?
I'm afraid not; it is a question of memorising those and using them a lot when you practise.
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