[ Tenses ]
Listen! I _________________ (think) someone _________________ (knock) at the door.
A. think – knocks
B. thought – is knocking
C. think – is knocking

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Subject Verb Agreement & Subjunctive MoodGrammar: Adjectives & PrepositionsLanguage Features of an Opinion ArticleGrammar and Sentence CorrectionCompound SentencesAntonymsTenses and VerbsSports VocabularyHas and HaveApostrophe GrammarOther quiz:
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A. Much
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Dollar
A. Countable
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