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U.S. Aerospace. Orbiting Astronomical Observatory: one of a series of scientific satellites that studied astronomical phenomena at ultraviolet and x-ray wavelengths.
QUIZ YOURSELF ON THE 12 TYPES OF VERB TENSES!
Loosen up your grammar muscles because it’s time to test your knowledge on verb tenses!
Question 1 of 6
The verb tenses can be split into which 3 primary categories?
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021