benefit by, benefit from
The expression benefit from means to receive an advantage because of the action or existence of something.
- Aspiring athletes benefit greatly not only from participating in regional competitive events, but also from watching world-class athletes in the Olympics.
- The people of Ontario and Quebec benefit economically from the abundance of hydroelectricity.
Benefit by has a more limited use and refers strictly to an advantage received as the result of a given action.
- Newfoundlanders still debate whether they benefited by joining Confederation in 1949.
Note: For the simple past and the present participle of the verb benefit, the recommended spelling is benefited and benefiting.
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