英和和英

I can't tell.

I am not certain [sure].

I can't say for certain.

to be unable to speak

I can't say for sure.

I cannot say.

I can't say.

That's hard to say.

You know what it is.

It goes without saying.

Save your breath.

I cannot say that.

I must not say that.

I couldn't say no.

I can only say that.

I have nothing left to say except 〜.

I cannot talk.

I just don't know what to say.

I can't say anything.

I cannot say what I want to say.

I don't know what to say.

I'm at a loss for words.

I will not say it.

I cannot say the things that I want to say.

I'm not sure I can do it.

I can't say for certain.

I'm not going to tell you.

I told you so!

I'm afraid I'm unable to say anything in regards to that.

I don't have a say.