Are 'I can tell you/ I'm telling you/ I tell you' interchangeable and used to emphasize that you're telling the truth? For example:
- I can tell you that he's lying.
- I'm telling you, he's really good at this game.
- You'll lose against him. I tell you.
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.Sign up to join this community
In short, I can tell you, yes, they are. The meanings are similar, as follows:
In all of them, the statement is made or implied, and I hope that in considering the fact that I am telling you will make you review the statement in this context, and in thinking about it again it will "rivet" the facts in your mind.
The emphasis is weakened a bit by self-reference; if "I tell you" is the only argument that I can give, I hope you will have the discernment to take it with a grain of salt. So, to back my argument up, here is what Cambridge.org has to say:
(also I tell you, I can tell you) used to emphasize that what you are saying is true, and should be believed: I'm telling you, he's the best player in the American League. We've been waiting a long time for this, I'll tell you.
Also see I'll tell you what at Mirriam-Webster.