二十七.off作介词的用法:
①.从上下来, 脱离(相当于down from或away from)
a. The picture fell off the wall.
b. The man jumped off the horse.
c. She was knocked off the bike in the street.
②.不在上面
a. Green peas is now off the menu.
b. The ship was blown off its course.
c. What he said was off the subject.
③.在离不远处
a. They lived in a little house off Harbor Street.
b. There is a petrol station just off the main road.
④.词组和固定搭配: off balance失去平衡; off duty不上班, 下班
二十八.on作介词的用法:
①.在上
a. Let us sit on the grass.
b. The boat was floating on the water.
c. Her apartment is on the 14th floor.
d. A policeman on the street corner saw him and followed him.
e. He couldnt keep his mind on his work.
②.在(一段时间)
a. She would come on Tuesday.
b. I plan to leave London on the evening of the 19th.
c. A party was held on New Years Eve.
d. On this occasion he said nothing.
③.在时, 在之后(此动作一发生, 另一动作立即发生, 相当于as soon as)
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