Grammar Patterns

N on n

The 'expert' group

These nouns refer to someone who knows a lot about something.
David Willis, a specialist on US affairs, looks at the implications for the President at home and abroad.
In the case of authority and expert, the preposition on is sometimes followed by an '-ing' clause or a wh-clause.
Since when has he been an authority on what children should watch on TV?
This man is a fighter pilot, but also an expert on defeating air defenses.
  • authority
  • expert
  • specialist
  • whizz
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