2017年托福语法介词专项辅导
导语：介词(又称作前置词，表示名词、代词等与句中其他词的关系，在句中不能单独作句子成分。下面YJBYS小编向大家介绍介词的用法，希望对你有用!
1. between/among，between不一定只是两者之间，among 一定是两者以上
The distance/reaction between the stars/trees. 两两之间
among the two separate realms.领域 ×
2. in/for/since (与时态有关)
(1) in + 时刻点 eg: in 1979 用于一般过去时
in+一段时间 eg: in recent years 用于完成时态, in two days 用于将来时态
(2) for 作爲conj. “因为”，引导塬因状语从句，并列连词,不能位于句首只能位于句中
for 作爲prep. for+ 一段时间 for three years 可用于各种过去时态或完成时态
例题：
Adella Prentiss Hrghes (served) (as) (manager) of the Cleveland Orchestra (since) fifteen years.
答案: D sinceàfor
(3) since 作爲conj., “因为”“自从”， 引导塬因状语从句，句首居多，Since +句子，句子。等于because
作爲prep., “自从”+时刻点， eg: since 1949 用于完成时态(“自从”+句子，出现较少)
作爲adv. A. 与完成时连用，表示过去某个时间某个事件到现在 since have done
B. 与过去时连用时 = ago
例题：
50. Tom was elected (president) last semester, (but) he (since has devoted) (few) of his time to his job.
答案: D fewàlittle
51. The (oldest) public edifice in Washington D.C., the White House was (originally) constructed in the 1790’s, (also) has been rebuilt or extensively remodeled (three times since).
答案: C alsoàand
52. Eleanor Roosevelt (set) the standard against which the (wives) of (all) United States Presidents since have (evaluated).
答案: D evaluatedàbeen evaluated
3. through/ throughout
(1)through: “穿过”(某一具体物体) eg: through the earth
“通过”(某一具体方式)=by eg: through X-ray analyses
例题：
(Although) fluorine氟 (tests) and x-ray analyses, archaeologists (can prove) the (validity)合理性 of artifacts.
答案: A althoughàthough
(2)throughout +时间，“贯穿” eg: throughout his lifetime
(Throughout) the 1930’s, United States government (patronage the) arts (was concentrated) in the section of the Works Progress Administration (known as) Federal One.
答案: B patronage theà patronage to the
thoughout+地点，“遍佈” eg: throughout the world
例题：
(Serving) as chief of the United States Children’s Bureau from 1921 to 1934, Grace AbBott (fought) for the (rights) of women and children (through) the world.
答案: D throughàthroughout
4. in, inside /into
in, inside 表示静态，强调一种状态 eg: air inside a house
into 表示动态，强调一种动作和过程 eg: shot arrows into the sky
(There is) evidence that the caribou originated (into) North America and crossed (over) a land bridge into Asia and (evolved) into the Old World’s reindeer.
答案: B intoàin
