58.My little sister ____ six next month.

两个英语句子My little sister (will be)six next mouth.为什么will be不能换 my little brother is only six _____(month) old. 为什么next month my sister will be twenty -one. My sister ________ [be] a nurse next month. My little sister is only____.A.six years B .six years old C. Next year my little sister ___ten years old. My little sister is ____ ____ ____to go to school. My little brother is ____.A.a six-years old boy B.a six-year 1.My little sister is______(near)six feet tall.2.Last year , Next year my little sister is to be ten years.中的is to be My father will go to Beijing on ____（出差) next month. I ____ my gradparents next month (visit)填什么 ,为什么这样填?