Question

I can not do without you，我不能没有你，这样说对吗？

Answer 1

是正确的

另外，do without 是一个词组
do without
1）.不干(某事)；不吃；不用；缺乏，没有：
In her work she cannot do without a computer.
她工作不能没有电脑。

2）.没有…而设法对付过去，没有…也行，没有…也无妨：
A car is something we can't do without.
没有汽车我们是不行的。
We'll just have to do without a car until they fix it.
在他们把汽车修理好之前，我们只好没有汽车而设法对付过去。

3）.将就，设法对付过去：
We haven't enough money to buy a new apartment, so we'll just have to do without.
我们没有足够的钱买一套新公寓房间，所以只好将就了。
The store doesn't have any, so you'll have to do without.
商店里什么都没有，所以你只好将就了。
We had to do without fresh fruit and vegetable.
没有新鲜水果和蔬菜，我们不得不将就一下。

4）.希望没有，用不着，不要[与 can， could 连用，常含有厌恶之意]：
I can do without your advice, if you don't mind.
要是你不介意，我用不着你的劝告。

5）.放弃，摒弃，省掉：
During the flood we had to do without luxuries.
水灾期间我们不得不舍弃奢侈品。
We'll just have to do without for a while.
我们只好暂时省掉。。

Answer 2

嗯，很好了呀。