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Ways of saying you are sure

surely

adverb

without any doubt

undoubtedly

adverb

used for saying that something is certainly true or is accepted by everyone

I bet/I’ll bet (that)

used for saying that you are sure about something

correct me if I’m wrong

used when you are fairly sure that you are right, especially as a way of politely disagreeing with someone

unless I’m mistaken

used for politely saying you are certain that you are right about something

beyond/without a shadow of a doubt

used for saying that you are completely certain of something

know for a fact (that)

used for emphasizing that you are sure something is true

put money on something

used for emphasizing that you are completely certain that something will happen

no doubt/question but that

used for emphasizing that something is certain

in my humble opinion

used for expressing your opinion about something, especially when you are sure that you are right

Open Dictionary

garbage patch

a collection of debris, mostly consisting of plastic, which moves around in the sea …

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