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[ Tenses ]

Is this sentence written correctly?

Neither the teacher nor the principal know who let the crows into the school gymnasium.

A. Yes

B. No

Select your answer:
         


Topics :

Modal Verbs for Deduction FOR & SINCE Positive and Negative Connotations Gerund or to Infinitive Modal Verbs & Time Prepositions Grammar, Literature, and Vocabulary Possessive Adjectives VS Possessive Pronouns Comparative and Superlative Adjective Verb Forms and Prepositions Past Modals & Phrasal Modals of Obbligation Modal Probability Adjectives Uncountable Nouns Past Narrative Tenses Gerund, Participle, Infinitive, or Appositive Past Simple and Past Progressive No Excuse Words / Conjunction SO Has Got & Have Got Tenses of Verbs Quantifiers / Prepositions of Time and Comparative Adjectives Comparision TOEFL Grammar Order of Adjectives Time Clauses of Future How much and how many Wish clause Grammar and Idioms Gerund or Infinitive Simple Present Tense Adjectives or Adverbs Present Continuous vs Future Tenses Future Perfect Tense Comparative Adverb Present Perfect - Just, Already, Yet Present Tense vs Past Tense Subject, Object, Possessive Pronoun and Possessive Adjectives Verb Tenses and Subject Verb Agreement Adverb of Manners Modals, Infinitives and Gerunds Simple Past or Past Continuous Verbs + Gerund or Infinitive Past simple regular verbs Adverbial Clauses of Manner and Result Linking Words and Phrases City Places Present Tense vs Present Continuous Personification The First Conditional (if/unless) Present Progressive Antonyms Simple Compound and Complex Sentences Relative Pronouns and Adverbs Modal Relative Clauses with who and which another/the others/each other/one another First and Second Conditional Present Perfect and Past Tenses On, At, By Gender and Grammar Gerund Noun Adverbs, Prefixes, and Suffixes Wish Sentences Noun Phrases and Verb Phrases 1st Conditional Modals and Semi-Modals Vocabulary and Sentence Structure Pronouns and Adverbs Do / Have / Can - Basic Questions Subject and Verb Agreement Phrasal Verbs Have as verb and auxiliary Adverbial Clause of Manner Vocabulary and Definitions Pronoun-Verb Agreement Food Vocabulary Adverb Phrases Modals Wish, Unless, If sentence Modal Requests Infinitives and Gerunds Adjective Preposition and Conjunction Was & Were Questions Present and Past Tenses Grammar - Countable/ Uncountable Subject/Verb Agreement with Collective Nouns Conditional Type 1 Past Tense and Perfect Tense Verb Ability Superlatives Grammar and Passive Voice Reflexive Pronouns & Modal Verbs Direct and Indirect Question Gerund/ To Verb/ Verb Intermediate Tenses & Passive Preposition of Time Noun Clause Grammar: Syntax Vocabulary, Grammar, Spelling