[ Speculation with Modal Verbs ]
What’s that noise? I’m not sure, it …. be the dog.
A. must
B. could
C. can’t

Random Topics:
Definite and Indefinite ArticlesMixed GrammarDegrees of ComparisonPresent Perfect: for/sinceNoun PhrasesPassive Voice with Modal VerbsRelative Pronouns with PrepositionsVerbal CommunicationTenses and StructuresSimple Present VS Present ContinuousOther quiz:
Sentence Structure › ViewI studied all night for the exam, I wanted to get a good grade.
A. exam I
B. NO CHANGE
C. exam; I
D. exam. I
Grammar › View
The scientist explained that water ___ (boil) at 100 degrees Celsius.
A. boiled
B. boils
C. had boiled
Adjective › ViewWe were ______ by his talk.
a. stimulating
B. stimulated
Grammar › View
Identify what the underlined word is in the sentence.
Grace cleaned up the broken glass
A. Gerund
B. Infinitive
C. Participle
