Io non posso essere sicuro.

English Translation

I can’t be sure.

I am not sure (;-)) about this.
“Certo” means “sure” and “sicuro” means “safe” but sometimes “sicuro” can also mean “sure” but “certo” never means “safe”?

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essere al sicuro = to be safe
essere sicuro = to be sure

“Just to be safe”(with the meaning of [to do something just] in case it is necessary) = solo per essere sicuri.

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