They …. know if the floor is slippery. A. ... | GrammarQuiz.Net

[ Grammar ]

They …. know if the floor is slippery.

A. is

B. am

C. are

D. were

Select your answer:
A B C D E

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Passive Voice - Present Continuous Relative Clauses and etc Similes and Body Idioms Cohesive Devices Adjectives & Preposition Auxiliary Verbs & Question Tags Adjective & Adverb Sentence Structure and Conjunctions TOEFL Adjective and Adverb Gerund & Infinitives

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