Context: I doubt that I saw him before.
It seems that I saw him before.
I am not sure that I saw him before.
Please check them. Are they the same?
These are better with the present perfect tense ( have seen ). Some are similar, but they are not all exactly the same. It seems (that) I've seen him before.
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These are better with the present perfect tense (have seen).
Some are similar, but they are not all exactly the same.
It seems (that) I've seen him before. (I believe that I have seen him before. He looks familiar.)
I doubt (that) I've seen him before. (I do not believe that I have seen him before. He does not look familiar.)
I'm not sure (that)