题目内容：

you are too young to start doing things 用 so that 和 not enough to 把句子换
就像同义句那样

优质解答

you are so young that you can‘t start doing things.
you are not old enough to start doing things.

追问：

you are so young that you can‘t start doing things第二个you可以去掉么？原句没有也

追答：

不行 so that最大的区别就是too to 后面加短语，而so that后面加从句~

追问：

所以从句要有主语么？

追答：

从句是一个完整句子，必须要有主谓宾~