[ Gerund or to Infinitive ]
I’m trying really hard ______ this text.
A. to understand
B. understand
C. understanding
D. understood

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Verbs: Action, Linking, and HelpingTOEFL GrammarSubject Verb Agreement and Verb TensesPresent Simple vs Present ContinuousEssential and Nonessential ClausesPresent ProgressiveGrammar (Adverbs, Prepositions, Prepositional Phrases)Should, Should not haveSubject Verb Agreement Irregular VerbSimple TensesOther quiz:
Vocabulary › ViewWhen a verb or noun conforms to the common rule.
A. Plural
B. Regular
C. Irregular
D. Paragraph
Modals › View
He ——-pay you the loan he owes you.
A. ought to
B. dare
C. used to
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A. Change
B. Changes
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When I arrived, they………….. already (leave) __________ for the airport.
A. left
B. had… left
C. were leaving
