在吃午饭是at（在吃午饭是at）

当我们想谈论一个动作发生的时间时，

前面肯定会搭配一个介词。

最常见的是at, in和on。

很多同学都弄不清这三个介词具体搭配哪个时间

今天我们就来一起梳理一下~

AT当我们想指一个特定的时间点时，我们使用介词at，指某个特定的小时。Henry's test ends at 3 o'clock! He is afraid he won't finish!亨利的考试在3点结束!他担心自己完不成！Your plane leaves at 4:55pm. We should go to the airport now.你的飞机下午4:55起飞。我们现在应该去机场。当说到吃饭的时间时，我们也用at At lunch, I like to have a big glass of water.午餐时，我喜欢喝一大杯水。We always listen to the radio at breakfast-time so that we can hear the morning news.我们总是在早餐时间听收音机，这样我们就能听到早间新闻。一些固定的表达里也用at。比如下面的句子At that time, Maggie didn't know that he was a secret agent!那时候，玛姬不知道他是个特工！She was about to make a cup of tea, but right at that moment, the phone rang.她正要泡杯茶，但就在这时，电话响了。

IN当指年份，月份和季节的时候，我们用介词inWe love to go to the beach in the summer to build sand castles and swim in the sea.我们喜欢在夏天去海滩建造沙堡和在海里游泳。We moved into this house in 2003. 我们是2003年搬进这所房子的。Classes will begin in September. Be sure to sign up for all your courses before then.九月份开始上课。一定要在那之前注册你所有的课程。Back in the 1800s, women didn't have the same rights that they do today.在19世纪，女性没有今天这样的权利。In the winter of 1937, my grandfather was born.1937年冬天，我的祖父出生了。当我们想谈论一天中的某段时间时，我们也使用介词in。Greg is never hungry in the morning. His first meal is lunch!格雷格早上从不饿。他的第一餐是午餐My uncle likes to take a nap in the afternoon.我叔叔喜欢在下午小睡一会儿。Do your parents watch the news on television in the evening?你的父母晚上看电视上的新闻吗？ 但是，这有一个例外，当我们说night的时间时，我们用介词atRoosters never crow at night. They only start crowing in the morning.公鸡在晚上从来不叫。他们只在早晨开始打鸣。

on

当我们谈论一个特定的日子或日期时，我们使用介词on。

On Christmas Day, some families give each other gifts under the Christmas tree. Other families have their celebrations on different special days.在圣诞节，一些家庭在圣诞树下互赠礼物。其他家庭在不同的特殊日子庆祝。

We have a very important meeting on Wednesday. Please don't be late!我们星期三有一个非常重要的会议。请不要迟到！

当我们谈论某天的(早上，晚上，等等)时，我们也使用介词on。

There was a big parade on Saturday afternoon. 星期六下午有一个大游行。

She has a lot of trouble getting out of bed on Monday mornings!星期一早上她起床总是很困难

I like to go to the park on the weekends.我喜欢在周末去公园

但是,记住!在美国我们用on the weekend，但在英国我们用at the weekend。两者都是正确的。