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primary source of energy vs primary source of energy for

These phrases are correct, but they're used in different contexts. 'Primary source of energy' is a complete phrase that can stand alone, while 'primary source of energy for' is used when specifying what the primary source of energy is for. The two phrases aren't directly comparable as they serve different purposes.
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Explained by Miss E.
Editor at TextRanch

Last updated: June 22, 2024

primary source of energy

This phrase is correct and commonly used in English.

This phrase is used to refer to the main or most important source of energy in a particular context.

primary source of energy for

This phrase is correct and commonly used in English.

This phrase is used when specifying what the primary source of energy is for, indicating the purpose or recipient of the energy.

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