介绍:
if I'm not mistaken
phrase [verb-link ADJECTIVE]
You use expressions such as if I'm not mistaken and unless I'm very much mistaken as a polite way of emphasizing the statement you are making, especially when you are confident that it is correct.
[emphasis]
I think he wanted to marry her, if I am not mistaken.
Unless I'm mistaken, he didn't specify what time.
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