in,on,at的用法
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用in的场合

(1)表示“在某年/月/季节”这个含义时,须用介词in

It often rains here in summer.夏天这里常常下雨.

(2)表示“从现在起一段时间以后”时,须用介词in.例如:

They will go to see you in a week.他们将在一周后去看望你.

(3)表示“在某世纪”时,须用介词in.例如:

This machine was invented in the eighteenth centur(4)表示“在某年代或特定世纪某年代”时,须用介词in.除此之外,morning / evening / afternoon 三个词也常跟介词in连用

用on的场合

(1)表示“在具体的某一天”或“(在具体的某一天的)早上、中午、晚上”等,须用介词on.例如:

Jack was born on May 10th

(2)表示“在星期几”或“在星期几的早上、中午、晚上”等,须用介词on.例如:

We don't go to school on Saturday and Sunda

(3)表示“在某一节日”时,须用介词on.例如:

We usually eat mooncakes on Mid-autumn Festiva

morning,evening,afternoon被of短语修饰,习惯上用in,而不用on.

用at的场合

(1)表示“某一具体时刻(即几点几分时)”,须用介词at.例如:

He gets up at six o'clock every day

(2)用在特定的时候(时节、时机)时,须用介词at.例如:

They were happy at that time.

(3)表示“在中午、在夜晚、在周末”时,须用介词at.例如:

What do you often do at noon?

(4)表示“在……岁”时,须用介词at.例如:

At the age of nine ,the boy could swim wel

求高人看一下,有没有错,有没有要补充的了.

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