Short, simple rephrasings for a 7-year-old: 'Underground trains run in tunnels and are very fast'

Three short, child-friendly rephrases of the sentence 'Underground trains run in tunnels and are very fast' for a 7-year-old, plus a quick 2-step tip for making sentences shorter.

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Here are three shorter ways to say that, for a 7-year-old:

  1. Underground trains go very fast.
  2. Trains run through tunnels quickly.
  3. Fast trains travel under the ground.

How I made them shorter:

  1. Kept the two main ideas: they are underground and they are fast.
  2. Used fewer, simpler words.

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