[ Adjective + to + Verb ]
it’s difficult to understand
A. a dog
B. a plane
C. an English book

Random Topics:
Relative Clauses beginning with PrepositionsPast Tense and Perfect Tense1st and 2nd ConditionalsConjunctions and Verb TensesModal Verbs for Permission and ObligationConjunctions in Complex Sentencesa, an, the, zero articleAdverb Clause ConnectorPossessive PronounsGerunds and InfitinitivesOther quiz:
Vocabulary › ViewPlease get ____ these old magazines.
A. ahead of
B. rid of
C. away from
D. out of
Past Perfect and Past Perfect Continuous Tense › View
The students had already completed the work when the teacher entered the class.
A. Past perfect tense
B. Simple past tense
C. Past continuous tense
D. Present continuous tense
Tenses › ViewLook out! We __________ crash!
A. are going to
B. will
C. shall
Grammar › View
a premise that is untrue or distorted
A. premise
B. false premise
C. faulty reasoning
D. false consensus