My sister is going to be 13 next year.请问这个句子正确吗?那也有My sister is to be 13 next year.和My sister will be 13 next year.请问这些有区别吗？

my sister is going to japan tomorrow对tomorrow提问 buy sister to a going is dictionary my排列句子 I with my sister _ to the park.A.is going B.are going C.am going D.be going my sister is going to see a play this weekend.改为一般疑问句[ ] [ ] sister going to [ ] a play this weekend？ My sister is going to leave at six tomorrow.(对at six tomorrow提问 __ __your sister going to leave? My mother is going buy toys ___ my sister .（to还是for)///要解释~ my sister is going to ___ ____ for her best friend.(画一张画)my sister is going to ___ ____ for her best friend.(画一张画) My sister is shorter than my brother.同义句My sister isn't _______ _______ _______ my brother. she is my sister. My sister is a my sister is a My sister is a my sister is my sister is my sister is zhangjing is my sister. don't like my sister's going to such a place.这里sister为什么要用名词所有格呢? 是I with my sister is going to go out for a picnic对还是I with my sister am going to go out for a picnic对?