[ Conditional Sentence ]
Unless you promise not to tell anyone, I won’t give you this letter
A. If you promise not to tell anyone, I will give you this letter.
B. If you don’t promise to tell anyone, I will give you this letter.
C. If you don’t promise to tell anyone, I won’t give you this letter.
D. If you promise not to tell anyone, I won’t give you this letter.

Random Topics:
Degrees of ComparisonVerb to haveTenses and ConclusionsTenses and Time MarkersSo, Such, Many, MuchPresent Perfect TenseTOEIC Grammar and Vocabulary ReviewConjunctions in Complex SentencesFuture Tense VocabularyGerunds and InfinitivesOther quiz:
Simple Present and Past Tense › ViewSimple Present Tense
Cows … (not/be) carnivore.
A. doesn’t
B. is not
C. not be
D. are not
Phrase or Clause › View
Four lamps, two flags, several posters, and six plants.
A. Phrase
B. Dependent Clause
C. Independent Clause