Quando eu uso "may" expressando duvida? Pode me explicar quando uso "may" e nao posso usar "can" ao inves?

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What are some fruits and vegetables that have different names in different countries, like palta (Chile) vs aguacate (Mexico)?
Nayane Bremm
How do you apply the masculine and feminine? Is it by speaker (ie. a man speaking uses the masculine regardless of who he is talking to), or it is who is being spoken to (ie. a man talking to a woman will use the feminine)?
Jonathan Benchlouch
Why does it seem like Portuguese uses definite articles more often than other languages like Spanish and English?
Nayane Bremm
How do I know when to use Akkusativ and when to use Dativ? Is there a rule?
Nayane Bremm
¿Cuál es la différencia entre "lastname" o "surname"?
Nayane Bremm
What is the Hebrew word for "they" if it is referring to a mixed gender group?
Jonathan Benchlouch
What's the difference between "du" and "Sie"?
Nayane Bremm
O que sao os verbos modais em inglês? Por que eles sao diferentes dos outros verbos?
Nayane Bremm
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