Why do you think that He doesn't know him from his schooldays means that he does know him? It would only have that sense if you added something like In fact, he first met him at university. Possibly, "I do know that" can in fact only be used, when, you are answering the question of whether or not you know the issue at hand (or your knowledge has been called in to question, and you are answering that challenge).

Understanding the Context

Let's say "out of the blue" you wanted to state that "you know that" -- and you wanted an emphatic version. "doesn't know" vs "don't know" [duplicate] - English Language & Usage ... Now that Logwatch has been configured, we can utilize it by executing the logwatch command. We also recommend including some options with the command such as --detail and --range to specify the level of detail we want to see in the output and the date range of logs to analyze, respectively.

Key Insights

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Final Thoughts

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