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

Random Topics:
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:
Progessive Tenses › ViewThey had been using their cellphone all night.
The correct tense for this sentence is__
A. past progessive
B. past perfect
C. past perfect progressive
D. past tense
Prepositions › View
Wait here ___ I come back.
a. until
b. since
c. for
The world (change, changes) so rapidly that we can hardly keep up.
A. Change
B. Changes
Perfect and Past Tenses › View
When I arrived, they………….. already (leave) __________ for the airport.
A. left
B. had… left
C. were leaving
