[ Modal Verbs of Certainty and Possibility ]
He _____ studying because I didn’t see him outside.
A. can have been
B. must have been

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Grammar - Imperatives and LetGerund, Infinitive & ModalsModals and Modal PerfectsGrammar - help/have/let/makeModals for Advice, Obligation/Prohibition, Necessity and Lack of NecessityFuture Tenses and Modals-ed or -ingLanguage Features of an Opinion ArticlePresent, Past, Present Perfect and Comparative-ed/-ing AdjectivesOther quiz:
Definitions, Synonyms › ViewChoose the best synonym for:
merit
A. Warrant
B. Comply with
C. Disprove
Verb Types and Tenses › View
What is the underlined word in ‘If you want to experience a country fully, you must learn the language’?
A. Gerund
B. Participle
C. Infinitive
D. Present Progressive Verb
Vocabulary › View_______________you want my advice, I will be in my room.
A. Even if
B. Only if
C. In case
Third Conditional › View
If she ……………… to Greenland, she ……………… some igloos.
A. Had been, would have seen
B. Had been, had seen
C. Would have been, had seen
