[ Adverbial Clauses ]
______ to the classroom after the break time, he found his bag was not there.
A. While he is returning
B. When he returned
C. Before he had returned
D. After he has returned

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Modal Verbs & Perfect InfinitivePresent Tense (Negatives and Questions)Verbal CommunicationFigurative Language VocabularyExpressing Obligation and ModalsPresent Progressive TenseTypes of PrepositionVerb TensesPresent simple & ContinuousSimple Past Irregular & NegativeOther quiz:
Tenses › ViewWhich of the following is an example of the Past Continuous tense?
A. She is writing a letter now.
B. She will be writing a letter at 3 PM tomorrow.
C. She was writing a letter when he arrived.
D. She writes a letter every day.
Grammar › View
Don’t forget ____ following rule.
A. a
B. x
C. an
D. the