b. Sugar is sold by the pound, and petrol by the gallon.
c. These workers are paid by the week.
d. He buys them by the dozen.
e. I rent the house by the year.
⑨.表示数量增减或差别的程度
a. We lost the match by one goal.
b. He is older by five years than John.
c. The water level has risen by 2 meters as a result of the heavy rain.
⑩.表示尺寸, 距离等, 相当于 乘以
a. I want a piece of paper 3 inches by 5 inches.
b. This room is forty feet by twenty.
⑩.词组和固定搭配: by accident偶然地; by chance偶然地, 碰巧; by means of借助于, 靠; by mistake出于误会, 弄错了; by oneself单独地, 独立地; by the way顺便说; by turns轮流; learn by heart记熟; one by one一个接一个地; little by little一点点地; side by side并肩地, 并排地;
十七.down作介词的用法:
①.沿着向下
a. Together we walked down the stairs.
b. The boats sail up and down the river.
②.沿着
a. I was walking down the street when he called me from behind.
b. They walked down the path for half an hour before they got to the lake.
十八.during作介词的用法: 表示 在一段时间内, 在某时期内
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