[ The First Conditional Sentence ]
He’ll be late for the train if he ____________(not start) at once.
A. don’t start
B. doesn’t start
C. did not start
D. will not start

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Grammar for TOEFLApostrophe GrammarSimple Present and Present ContinuosSentence and FragmentCompound and Complex, ConditionalsReported speech (statements)Verb & GrammarModals and InversionActive & Passive VoiceVerbsOther quiz:
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A. TRUE
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There was a strange man ___ in the doorway.
A. to stand
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Differentiate between ‘for’ and ‘since’ in terms of time expressions.
A. ‘For’ is used for specific dates; ‘since’ is used for general time periods.
B. ‘For’ and ‘since’ can be used interchangeably in all contexts.
C. ‘For’ indicates duration; ‘since’ indicates a starting point.
D. ‘For’ indicates a starting point; ‘since’ indicates duration.