I have to say that I find it difficult to remember everything.

我不得不说我觉得记住所有事情很难。

But I have to say that it's partly your fault, isn't it?

但我不得不说，这部分是你的错，不是吗？

And to say hello.But now I have to say goodbye.

还来问候你。但是现在我必须得跟你说再见了。

That's all I have to say.

这就是我要说的。

I have to say I love UNT products!

我必须说我爱UNT 的产品！

I have to say goodbye to you all.

我得向诸位道别了。

I have to say I disapprove of tax avoidance.

我得说我不赞成逃税.

I have to say, they are pretty good.

我不得不说,这非常不错。

I have to say I dIsapprove of tax avoIdance.

我得说我不赞成逃税。

Now I have to say, that was back in 2005.

我不得不说，这个想法发生在2005年。