英語學(xué)習(xí)的過程中，大家認為最難的就是語法部分。介詞是考試中出現(xiàn)的比較多的一個部分，而其中考的最多的就是介詞的固定搭配問題。

(一) 介詞搭配

例：The teeth in the upper jaw function together those in the lower jaw to cut, tear, and grind food.

分析：和…一起，所以together in應(yīng)該為together with，

例：The Allegheny Mountain range is rich of coal.

分析：be rich of 改為be rich in

例：The rotation of the Earth on its axis is responsible to the alternation of periods of light and darkness.

分析：responsible to 應(yīng)改為responsible for。形容詞responsible后接名詞作賓語時要加介詞for。

(二) 最重要的兩個介詞

1、介詞of 多余或者遺漏

例：Mosquitoes usually lay eggs, singly or in batches, on top stagnant water.

分析：on top 應(yīng)改為top of stagnant。on top of …是因定表達法，意為“在…上面”。

例：Christopher Plummer is a Canadian actor who has starred in stage, television, and film productions on both sides the Atlantic Ocean.

分析：sides the 應(yīng)改為sides of the。 sides為名詞，the Atlantic Ocean也是名詞，中間明顯少了一個介詞。

2、介詞by

一種情況表示被動，be+過去分詞+by

另一種表示通過……的方式， by doing

例：The ceremony of marriage in the United States can be performed from a justice of the peace.

分析：performed from 應(yīng)改為performed by。謂語動詞是被動式，performed的動作執(zhí)行者應(yīng)該由介詞by來引導(dǎo)。

例：Along the east coast ,American Indian women's councils could veto a declaration of war at refusing to supply moccasins and field rations.

分析：refusing to 應(yīng)改為by refusing。通過拒絕提供鞋子和糧食，表示通過某種方式做某事要用介詞by,故將at refusing 改為by refusing。

例：Algebra is the branch of mathematics concerned with operations on sets of numbers or other elements that are often represented at symbols.

分析：at應(yīng)改為by。動作的發(fā)出者應(yīng)該用介詞by來引導(dǎo)

以上就是小編給大家分享的四級考點，希望可以給大家在備考的時候帶來幫助。