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Jigneshbharati Posted 9 years ago
Grammar

Pass across

Sound waves and light waves change speed when they pass across the boundary between two substances with different densities, such as air and glass.

http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/wave_model/lightandsoundrev3.shtml

Is "pass across" a phrasal verb or "across" a plain preposition meaning from one side to the other?

  

Top answer

The latter.

  • The latter.
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