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Anonymous Posted 11 years ago
Grammar

Dear Teachers, I am confused of using ``that´´ or ``that of´´ in the sentence below. Please correct it. Thanks a million.
Gravity on the earth is greater than that/that of on the moon.
  

Top answer

You have a choice, both of which are OK: Earth’s gravity is greater than that of the moon. (omitting ‘the’ and ‘of’) Gravity on Earth is greater than that on the moon. (because of ‘on’ in both)

  • You have a choice, both of which are OK: Earth’s gravity is greater than that of the moon.
  • (omitting ‘the’ and ‘of’) Gravity on Earth is greater than that on the moon.
  • (because of ‘on’ in both)
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5 Answers
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You have a choice, both of which are OK:
Earth’s gravity is greater than that of the moon. (omitting ‘the’ and ‘of’)
Gravity on Earth is greater than that on the moon. (because of ‘on’ in both)
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Here is another option:
The earth's gravity is greater than the moon's(, because the earth has more mass).
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How about ``The force of gravity on the earth is greater than that of on the moon? Is it grammatically correct? Thank again.
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The word ‘that’ represents “the force of gravity” in your sentence.
So the sentence becomes “The force of gravity on Earth is greater than that on the moon.”

I am not comfortable with “The earth” since the planets have names; and Earth is one of them.
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Here are a few ways you can say it.

The gravity on the earth is greater than the gravity on the moon.
Gravity on the earth is greater than it is on the moon.
Gravity on the earth is greater than on the moon.

CJ

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