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TensesPresent Simple & Present ContinuousAuxiliary WordsFuture Perfect vs Future ContinuousModals and Past ModalsSentence Structure and Grammar RulesCommasMust / must notGrammar for TOEFLEnglish ArticleOther quiz:
Grammar › ViewPollution levels are increasing ______ the traffic.
A. because
B. due to
C. result
D. so
Clause Markers TOEFL Grammar › View
Complete the sentence with the best clause marker: The place that the signal came from , _________ on a hill or a valley – conveyed most of the meaning of an Apache smoke signal.
A. why
B. whether
C. so that
D. because