THE PREPOSITION

§ 245. A preposition is a function word indicating a relation between two notional words. Its semantic significance becomes evident when different prepositions are used with one and the same word, as in:

to goto the park, to goacross the park, to goround the park, to go out of the park, to gothrough the

park, etc.

A preposition may altogether change the meaning of the verb:

he shot the officer (he aimed at him and hit him),

he shot at the officer (he aimed at him but probably missed).

Although the tradition of differentiating prepositions from other word classes (conjunctions, and in some cases adverbs) is well established, it is not always easy to draw the border-line; nearly all one-word prepositions can also function as adverbs or as conjunctions, their status being determined only syntactically. A few words - after, before, since, for (with the change of meaning), behind - may function not only as adverbs, adverbial postpositions, or conjunctions, but also as prepositions. Compare the following groups of sentences:

They sailed up (postposition).

They sailed up the river (preposition).

Everybody was up at the sound of the bell (adverb).

The milk boiled over (postposition).

He presided over the meeting (preposition).

I can’t tolerate such men as him (preposition).

As he was passing the door he turned back (conjunction).

No one saw him but me (preposition).

But no one saw him (conjunction).

He is stronger than me (preposition).

He is stronger than I am (conjunction).

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