I assume that the alternatives are: 1. " 2. " These are both correct English, but the function of "that" is different.
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I assume that the alternatives are:
1. "I am sure that it's fine."
2. "I am sure that is fine."
These are both correct English, but the function of "that" is different. In (1), the word "that" is a conjunction introducing the thing that you are sure about, namely "it's fine". In (2), "that" is a pronoun, referring to something previously mentioned. The "that" of the first sente