"answer" is probably the wrong verb. Probably you mean "I think he would know". That is slightly more distanced or tentative than "I think he'll know", but there is not a huge difference.
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GPY"answer" is probably the wrong verb. Probably you mean "I think he would know". That is slightly more distanced or tentative than "I think he'll know", but there is not a huge difference.tentative means less sure?