[ Present Perfect and Past Simple ]
His collection of stamps is really impressive. I wonder how many he …… so far.
A. has collected
B. collected
C. hasn’t collected
D. didn’t collect
Select your answer:

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Adjectives Ed and IngTo Infinitive or Bare InfinitiveVerb Tenses and ModalsConjunctive AdverbWho or WhomPreposition & Relative ClausesPresent, Past, and Future TimeConditional Sentences with Modal VerbsTense,noun,preposition,quantitySubject Verb Agreement and TensesOther quiz:
Grammar : Structural Common Errors › ViewWhere the bus?
A. Right
B. Wrong
Grammar › View
Mathematics is Samuel’s ——— subject.
A. right
B. best
C. good
D. real
