[ Modal Auxiliary Verbs ]
They ______ (have to / must) clean their room before they can go out.
A. have to
B. must

Random Topics:
Nouns as AdjectivesPresent Simple & Present Continuous TensesPresent Perfect Simple and ContinuousNouns, Pronouns, Antecedents, and Singular and PluralThe Present Progressive TenseModal Verbs for PossibilityConjunctive AdverbPhrases and ClausesModal PerfectThe Future Simple TenseOther quiz:
Tenses › ViewWhat are some typical keywords for the present tense?
A. this year, this month, today
B. at the moment, right now
C. for, since, yet, never
D. always, usually, sometimes, never
Grammar › View
Are there _____ in your briefcase?
A. any notebooks
B. a pen
