[ Modal Verbs ]
______wear life jackets in the boat?
B: Yes, it’s obligatory
A. Can we
B. Can’t we
C. Do we have to

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Must / must notPossessive Pronouns and QuantifiersAdjectives and VocabularyIndirect SpeechModals of Speculation and DeductionPresent Simple/AffirmativePast Progressive TenseIndefinite and Reflexive PronounsAdverb of Frequency and TensesPassive Voice in Past and Present TenseOther quiz:
Modal Auxiliary › View…….. you ask them about the prices of the tickets to visit the Huayna Picchu or mountain hike?
A. Can
B. May
C. Might
D. May not
Expressing Obligation and Modals › View
You …. use a telephone in class.
A. must
B. must not