Topics: Perfect Tenses
What are the signal words for the Present Perfect Tense?
A. yesterday, last week, ago
B. soon, later, tomorrow
C. before, after, when
D. by the time, by, in 2015
Select your answer:

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ConjunctivesAdjectives and comparisonsVerb Tenses and SubordinatesPossesive Pronouns and Modals of AbilityLinkers and ConjunctionsGrammar (Adjectives)Simple Future - WillConjunctions and TransitionsGerunds + To InfinitiveBe Verb in TensesOther quiz:
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The use of vitamin supplements and herbs ___ becoming increasingly popular among Americans.
A. Is
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