[ Grammar ]
The use of reference books _____ necessary for learning a language.
A. is
B. are

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Adjective or AdverbPresent Perfect Simple vs ContinuousAcademic VocabularyTenses - AuxiliariesPresent Perfect and Present Perfect Progressive TensesGrammar & VocabTo Infinitive or Bare InfinitiveConditional Sentence Type 3PronounAdverbial ClausesOther quiz:
Grammar › ViewWhich of the following is a complete sentence?
A. The newspapers are supposed to be delivered by 7:00, but I am usually finished before 6:45.
B. I called the delivery service this morning, they told me the shipment would arrive on time.
C. Look in the closet you should find it there.
D. I was the first to sign the petition Harry was second.
Question Tag › View
Martha and Jerry like tunafish,
A. do you?
B. don’t you?
C. did you?
D. didn´t you?
Adjective Clause › ViewWhat is the adjective phrase in this sentence? The cabin beside the lake was already occupied when we arrived.
A. When we arrived
B. Beside the lake
C. Was already occupied
Grammar › View
The food ___ by the chef.
A. is cooked
B. cooked
C. cooks
D. cooking