Hi Michal This is the order of my preference 1) My health has considerably improved over the last few years. OK 2) My health has considerably improved in the last few years. OK It implies an improvement when you compare your state of health at the beginning to the state at the end point.
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AlpheccaStars5) My health has considerably improved within the last few years. OKThis is very interesting! I sometimes can smell out implications that some words tend to have but I would never
It implies that before this period, your health had been going downhill and there was a turnaround a few years ago.
MichalSWouldn't you say that during/over/within imply a similar continuous improvement?Given the nature of health situations, I'd say a qualified yes.