* Ebook which has no counterpart on the market* Quiz equipped with the key which consists in deciphering which sentences are correct and incorrect:He is sure to succeed. He is certain to succeed. It is sure that he will succeed. It is certain that he will succeed. * 200 sets of contrastive examples in carefully selected contexts* Selective and inspiring collection of sentences* Focus on enhancing the minutest differences* An informative resource for inquisitive English learners who enjoy challenging themselves