Grammar Patterns

the N

The 'sound barrier' group

These nouns refer to a significant point or level.
Until 1604 the age of consent was twelve for a girl, fourteen for a boy.
In 1947, Chuck Yeager became the first man to break the sound barrier.
  • age of consent
  • pain barrier
  • poverty line
  • sound barrier
  • speed limit
  • watershed
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