I think the first one should be this way: 1. If it wasn't for boxing, I would have been dead by now . It means it has been probable to die until now.
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Persian LearnerI think the first one should be this way:1. If it wasn't for boxing, I would have been dead by now.The first is fine as it is.
deepujiWhat is the difference betweenThe difference is minimal. "now" is self-explanatory. "by now" is "now or before now".