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【专题导航】介词是虚词,不能单独作句子成分,必须与名词、代词、动名词、从句、疑问词加不定式构成介词短语,在句中充当表语、定语、状语和宾补等成分。常见的介词分为:1.简单介词,如at,in,for等;2.合成介词,如within,inside,onto,throughout等;3.短语介词,如according to,out of,because of,by means of,in spite of,instead of等。4.双重介词,如from behind/above/under,until after等。
Prepositions are function words. They can not be used alone as sentence elements. They must form prepositional phrases with nouns, pronouns, nouns, clauses, interrogative words and infinitives, and act as a prepositional phrase, an attributive, an adverbial object, and a guest complement in a sentence. Common prepositions are divided into: 1. Simple prepositions, such as at, in, for, etc .; 2. Synthetic prepositions, such as within, inside, onto, throughout, etc .; 3. Phrases prepositions, such as according to, out of, because of, by means of, in spite of, instead of etc. 4. Double prepositions, such as from behind / above / under, until after and so on.