may 用於较委婉的语句,一般常用於疑问句的开头,can 也可这样用!但用於否定的句子中may是不适合的!can't可用於否定句的开头!
can & may-- Mum,I've been studying English since 8 o'clock._
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----Mum,I've been studying English since 8 o'clock.________
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翻译She hasn't been speaking since 9 o'clock.