This paper mainly discussed the looming problem of de behind the adverbs used as adverbial, and we argues de is the symbol of descriptive adverbial. The appearance of de demands the adverb being descriptive in semantic, and limit adverbs usually cannot follow de; overlap can enhance the description of adverb, making some restrictive adverbs can also follow de in behind.Rhythm and the syntax restrict the appearance of de in some aspect; de appears in the situation conditions is mainly pragmatic in action. In addition, genre, personal style and other factors also play roles in the appearance of de.At the same time, this paper tries to explore the concealment and appearance rules of de, and applies these rules to the TCFL. Firstly, we start from syllable, showing the looming rules of de on the syllable of adverbs; secondly, from the syntactic perspective, showing the syntactic constraints on the appearance of de, finally, making the students master the relationship between adverbs and the concealment and appearance of de. In this way, students can catch the rules of the concealment and appearance of de in adverbs used as adverbial. |