英文介詞種類繁多且詞意多變。不過，涉及的有關介詞的題目重復性很強，而且有規律可循。命題焦點售在中（1）含有介詞的固定短語，（2）含有特定含義的介詞誤用
介詞常考題型及解題要點
1.含有介詞的固定短語：短語或詞組中的介詞不能隨意更換或省略
例題分析
（1）Most aquatic animals breathe by means external respiratory organs called gills.
(答案) 正確的短語為by means of,其中的介詞of不能省略
（2） Speed refers only toward the rate of mution without
specifying any direction of motion.(94.8)
(答案) 正確短語形式為refer to
(3) Historical geology deals about data on the development of the Earth
gathered from the study of rocks, which are analyzed to determine their age and composition. (93.8)
(答案) 正確短語式式為deal with.
(4) The diamond is the only gemstone composed with just one chemical element, carbon.
(答案) 正確短語形式為。Be composed of
（5） Best known for his research in statistical mechanics and meson physics. Chen Ning Yang shared the Nobel Prize in 1957 to another physicist from the United States, Tsung-dao Lee.
(答案) 正確的短語搭配為 share.......with
(6) The doctrine of eminent domain is based the legal tradition that all real property is subject to the control of the state.
(答案) 正確的短語形式為be based on 其中的介詞on不能省掉。
2. 介詞用錯
解題要點 介詞與后面的名詞通常有固定的搭配習慣，或有特定的語意功能，不能隨意更換。通常，介詞畢有含義，不同的介詞會使整個句子表達不同的意思。當A、B、C、D四個選擇答案中出現單獨劃線的介詞，應首先考慮它是否使用正確。
全真例題分析
（1）Scientists claim that an individual can function from about three days when totally deprived of sleep.
(答案) from應改用for。表示動作延續的時間應用介詞for。
（2） Canadian scarlet-clad guards and mounties with horseback are part of the summer scenery in Ottawa.
(答案) with改為on, “騎在馬背上”應用介詞on表示位置。
（3） During eclipses of the Sun, the Ojibwa Indians of North America shot flaming arrows inside the sky to rekindle the light.
(答案) inside改為into, 介詞into表示的動作性；shot……into the sky。天空無邊無沿，不能用介詞inside來修飾。
（4） Wild elephants are almost continuously waving their trunks. Both up in the air and down aside the ground.
(答案) aside改為on。On the ground 是固定介賓搭配。Ground 沒有邊沿，無法用aside來修飾。
（5） Recent studies have shown that air into a house often has higher concentrations of contaminants than heavily polluted air outside.
(答案) into改為in。Into強調動作，而in表示的是靜止的狀態。“房間里面的空氣”只能用in來表示。
（6） The early use of a complete steel frame for towering buildings appeared in the first skyscraper, built on Chicago in 1883.
(答案) built on 改為built in。城市名前面只能用介詞in來修飾。
3.介詞between和among的區別
解題要點 between表示二者之間，among表示三者或更多的整體概念。當A、B、C、D四項選擇答案中出現between或者among時，它通常就是此題的命題焦點。
全真例題分析
(1) The determination of the path of Mars‘s orbit in 1609 became the unifying link among the two formerly separate realms of physics and astronomy.
(答案) among改為between
(2) The Carlsbad caverns, located in New Mexico, rank between the largest underground labyrinths in the world.
(答案) between改為among。表示多數概念，或范圍時應用among。
（3） For a long time cotton ranked first between Alabama‘s crops, but today it accounts for only a fraction of the agricultural production.
(答案) between改為among。表示范圍時應用among。