前置詞を征する者は英文を征す。と言われるくらい前置詞は大切な品詞です。
　 　

Prepositions

前　置　詞	時間を表す例文	基本的な意味
at	I get up at six every morning.	atはちょうどの時間を表す
in	We are going to leave in 30 minutes.	inはその時間以内を表す
by	He will come home by 6:00.	ある時間までの意味
on	I play tennis on Sunday.	onは曜日や特別の日付に
for	I studied English for long time.	forは期間を表す
before	I wash my hands before dinner.	〜の前に
during	I go to America during the summer vacation.	一定の期間を表す
after	I did my homework after dinner.	〜の後で
since	I have lived here since old.	〜からずっと
	場所を表す例文
at	We arrived at Nagoya station.	ある一つの場所を表す
in	I live in Nagoya.	広い場所を表す
for	He will leave for Tokyo tomorrow.	〜に向かって
to	I'm going to go to the zoo next Sunday.	目的地を表す
from	She comes from America.	出発地点を表す
on	There is a book on the desk.	くっついている状態
under	There are two cats under the table.	〜の下にある状態
by	He is standing by the window.	すぐそばに居る状態
near	Our school is near the lake.	近くにある状態
	手段を表す例文
in	I wrote a letter to my aunt in English.	〜で書く
with	I wrote a letter with a pen.	〜を用いて
by	We go to school by bus.	〜によって
	その他の例文
without	He went out without saying nothing.	何もない状態
with	I went to the park with my family.	〜と一緒に
like	He talks like a teacher.	〜のような(に)
about	We talked about his life.	〜について