See ↑ SURE/NOT SURE 1, ↑ THANK 5, ↑ YES 1,2,3
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• ↑ be bound to/be sure to/be certain to
• ↑ be sure
• ↑ for sure
• ↑ I'm not sure (about that)
• ↑ it's a safe bet/it's a sure bet/it's a sure thing
• ↑ make sure (that) you ...
• ↑ make sure/make certain
• ↑ not sure