[ Phrase or Clause ]
Words ending with -ing must have verbs of existence attached to them in order to be functioning as verbs.
A. Phrase
B. Dependent Clause
C. Independent Clause

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A. A serious document
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By the end of the week he … (spend) all his money.
A. will have spent
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Some people like to exercise indoors, _______________ others prefer to exercise outdoors.
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