I'm going to be six years old next year.
I:主语
am going to be:谓语
be going to:动词词组相当于情态动词,类似于will
be:实意动词
six years old:宾语
next year:时间状语
I'm going to be six years old next year.
I:主语
am going to be:谓语
be going to:动词词组相当于情态动词,类似于will
be:实意动词
six years old:宾语
next year:时间状语