[ Simple Past vs Past Continuous Tense ]
I_________understand what they ________ about.
A. did not/ talked
B. did not/ were talking
C. did not/ was talking
D. do not/ were talking

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Main Idea and Sentence StructureConjunctions, Interjections and Sentence TypeModals and Adjectives (ed-ing)used to, be used to, get used toPreposition and Word FormConjunctive AdverbGrammar - Countable/ UncountableAdjective SuffixesConjunctions - ConnectorsPassive Voice, Modals of Deduction and First ConditionalOther quiz:
Modal Verbs › ViewWhich modal verb is used in affirmative sentences to express strong obligation or necessity?
A. should
B. might
C. must
D. could
Prepositions › View
I am writing a book … grammar.
A. in
B. on
C. at