1.DO you have a Art Festival?2.Today is my sister's twelve birthday.

问题描述:

1.DO you have a Art Festival?2.Today is my sister's twelve birthday.
3.My mother's birthday is on July.
这三句话错在哪里,并改出.

第一句 要用an而不是用a,在元音前面要用an
第二句 要用twelfth表示第十二个生日
第三句 要用in而不是用on