[ Grammar ]
John ____________________________have called Amy, but he didn’t have her number. (past obligation)
A. must
B. could
C. should
D. may
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The Present Progressive TenseComparison of Adjective and AdverbGrammar - Verb FormsSecond Type ConditionalPronouns and Subject Verb AgreementAcademic VocabularyModal Verbs for Permission and Obligation1st and 2nd ConditionalsAdverbial Concession ClausesPassive Voice with ModalsOther quiz:
General Knowledge › ViewThe age of an tree can be determined by-
A. Measuring its height
B. Measuring its diameter
C. Analyzing its sap
D. Counting the annual growth rings of its stem
E. NONE OF THE ABOVE
Grammar › View
The swimming pool is deep. The lake is…
A. deeper than the swimming pool.
B. narrow than the swimming pool.
C. older than the swimming pool.
D. younger than the swimming pool.