Исправь ошибки.1)I'm oldest than my brother.2)My birthday is on twenty-one of April.3)Today is my mum brithday.4)My mum happy today.5)She is going have a brithday party.

1 Not oldest, but older2 Not twenty - one but the twenty first 3 Not mu, but mum's; birthday, not brithday4 It needs a verb is beetween mum and happy5 Not going have, but going to have; birthday, not brithday