I don'tknowforcertainif she's coming.
I can't say forcertainhowlongI'll be there.
There's very little weknowforcertainabout hisemotionallife.
Sheknewforcertainthat hisproblemswent beyond being indebt.
After ayearofinvestigations, no one canyetsay forcertainwhy she waskilled.
See alsocertainadjective(WITHOUT DOUBT)
Thesaurus: synonyms, antonyms, and examplescertain about something
- certainI feel certain that this change will be for the best.
- know/say for certainI can't say for certain, but I think he's coming to the party.
- sureDon't worry - I'm sure it won't be a problem.
- positive"Are you sure you let the cat in?" "I'm positive."
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