I can say in all sincerity that I knew nothing of these plans.

我可以十分坦诚地说，这些计划我一无所知。

《牛津词典》

I think I can say, without fear of contradiction , that...

就算有人反驳，我也胆敢说…

《牛津词典》

Without exaggeration I can say that I hardly slept a wink.

可以毫不夸大地说，我几乎没有合过眼。

《新英汉大辞典》

"I can say that,anecdotally, virtually all the teachers noticed immediately much more alertness in class, definitely more positive mood.

VOA: special.2010.10.07

And I'll say, alright, suppose I do take item 0, well I can't take item 0, right? Weighs too much.

所以，不能走这边的分支，回到这儿，好的。

麻省理工公开课 - 计算机科学及编程导论课程节选

You can say "this is where I am right now and this is what I'm going to do very, very soon."

你可以说，“这是我现在的情况，而那就是我很快就要做的事情。”

I'm about to 课堂 - SpeakingMax英语口语达人

"I cannot say I've been the best, but I can say I've done my best for 13 years" as a musician, he said.

NPR: Korean Pop Sensation Cracks Jokes At Harvard

And I got back on the 27th early morning, and at 2 o'clock Adi had called us to the house, and in his house I finally asked him, I say I can't take this, tell me, how's the film done?

CNN: Interview with Abhishek Bachchan

"I have played against Radwanska three times before and I won twice so I can say I actually like to play her -- she's not very aggressive and I always have enough time to hit winners, " Kirilenko told the Kremlin Cup Web site.

CNN: Kirilenko knocks Radwanska out of Kremlin Cup