YOU SAID:

I could but I can't think that I could that I can but could have done it

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できるけどできない、できるはずなのにできない

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I can do it but I can't, I should be able to do it but I can't

INTO JAPANESE

できるはずなのにできない、できるはずなのにできない

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I should be able to do it, but I can't. ...

INTO JAPANESE

できるはずなのにできない…。

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I know I can do it, but I can't...

INTO JAPANESE

できるとわかっているのに、できないんです...

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I know I can, but I just can't...

INTO JAPANESE

できるとわかっているのですが、できないんです...

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I know I can, but I can't...

INTO JAPANESE

できるとわかっているけど、できない…

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I know I can, but I can't...