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

Random Topics:
Grammar for TOEFLApostrophe GrammarSimple Present and Present ContinuosSentence and FragmentCompound and Complex, ConditionalsReported speech (statements)Verb & GrammarModals and InversionActive & Passive VoiceVerbsOther quiz:
Modal Verb Gerund or To Infinitive › ViewI know you didn’t see me yesterday because I was out of town. You……me yesterday.
A. shouldn’t have seen
B. mightn’t have seen
C. can’t have seen
D. can’t see
Tenses › View
She ___ the bed at present.
A. makes
B. is making
C. make
D. are making
Coordinating Conjunctions › ViewWas his tone harsh ____ teasing?
A. nor
B. or
Adverbs and Time Expressions › View
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.