我们知道sure和certain是近义词,都有“确信、肯定、有把握”的意思,常可互换通用。但sure所表示的仅仅是主观上的感觉,可能有些怀疑,语气一般,而certain则往往表示说话人有充分的理由,语气较强,因此,在实际的语言环境中sure多用于疑问、否定和口语中,而certain则多用于肯定句、正式书面语中。 We know that sure and certain are synonyms, all of which have the meaning of “sure, sure, sure” and can be used interchangeably. However, what Sure means is merely a subjective feeling which may be somewhat skeptical and in a tone of voice. Certain, on the other hand, often means that the speaker has a good reason and a strong tone. Therefore, it is often used in doubt, denial and Oral Chinese, and some are more for positive sentences, formal written language.