暗含否定是英语否定句型的关键和难点，暗含否定是通过动词、名词、形容词、介词等多种形式表达的。
Implied negation is the key and the most difficult point of negative drills. And it can be usually conveyed by means of some verbs, nouns, adjectives, prepositions, etc.
通常讨论的词组类型有四种，分别是：名词词组，动词词组，介词词组和形容词词组。
Four phrasal categories are commonly recognized and discussed, namely, noun phrase (NP), verb phrase (VP), prepositional phrase (PP), and adjective phrase (AP).
副词用来描述动词，它可以是单个词，介词加形容词，或者连词加句子。
The adverb is description for verbs, it can be a single word, preposition plus adjective, or conjunction plus a sentence.
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