[ Past Perfect Tense ]
I was sleeping when somebody knocked the door.
A. I was slept when somebody knocked the door.
B. I had slept when somebody knocked the door.
C. I have slept when somebody knocked the door.

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Noun QuantifiersCompound Nouns and Compound Adjectives QuestionsVerb ConjugationWH- Question WordsFirst Conditional & Future TensesVerbs & Phrasal VerbsFirst Conditional, Future Time ClausesGrammar (either..or.. and neither..nor..)GerundsWish, Unless, If sentenceOther quiz:
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A. go
B. to go
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. What verb form follows the helping verbs “has,” “have,” and “had” in perfect tenses?
A. Past participle
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A. That
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The underline word is a ______.
Hey! Can you take these books to the library when you go?
A. Noun
B. Verb
C. Adjective
D. Preposition
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