yanx Why not use "They have arranged a 24 heart monitor to make sure everything is ok" He could have but chose not to, and it would have meant the same as the longer sentence you suggest. He would have required the longer sentence had he not already said: "Had an ECG and all is good" (meaning they found his heart was in good condition), because the next sentence states the 24-hour heart monitor was to make certain his heart was good. So in this context, to be sure = to be certain (his heart is good).
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yanxWhy not use "They have arranged a 24 heart monitor to make sure everything is ok"He could have but chose not to, and it would have meant the same as the longer sentence you suggest. He would have required the longer sentence had he not already said: "Had an ECG and all is good" (meaning they found his heart was in good condition), because the next sentenc