導語：介詞(又稱作前置詞，表示名詞、代詞等與句中其他詞的關係，在句中不能單獨作句子成分。下面YJBYS小編向大家介紹介詞的用法，希望對你有用!
1. between/among，between不一定只是兩者之間，among 一定是兩者以上
The distance/reaction between the stars/trees. 兩兩之間
among the two separate realms.領域 ×
2. in/for/since (與時態有關)
(1) in + 時刻點 eg: in 1979 用於一般過去時
in+一段時間 eg: in recent years 用於完成時態, in two days 用於將來時態
(2) for 作為conj. “因為”，引導塬因狀語從句，並列連詞,不能位於句首隻能位於句中
for 作為prep. for+ 一段時間 for three years 可用於各種過去時態或完成時態
例題：
Adella Prentiss Hrghes (served) (as) (manager) of the Cleveland Orchestra (since) fifteen years.
答案: D sinceàfor
(3) since 作為conj., “因為”“自從”， 引導塬因狀語從句，句首居多，Since +句子，句子。等於because
作為prep., “自從”+時刻點， eg: since 1949 用於完成時態(“自從”+句子，出現較少)
作為adv. A. 與完成時連用，表示過去某個時間某個事件到現在 since have done
B. 與過去時連用時 = ago
例題：
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: “穿過”(某一具體物體) eg: through the earth
“通過”(某一具體方式)=by eg: through X-ray analyses
例題：
(Although) fluorine氟 (tests) and x-ray analyses, archaeologists (can prove) the (validity)合理性 of artifacts.
答案: A althoughàthough
(2)throughout +時間，“貫穿” 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+地點，“遍佈” eg: throughout the world
例題：
(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 表示靜態，強調一種狀態 eg: air inside a house
into 表示動態，強調一種動作和過程 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
