the morning前面可以加in，也可以加on。当加介词in时，表示某段时间，意为“在早上”，不具体是哪一天；当加介词on时，表示具体某一天，意为“在哪一天上午”。
一、in the morning的意思及双语例句
in the morning意为第二天上午;次日上午。表示某段时间。
例句：The boy's temperature came down in the morning.
那个小男孩的体温在早上降了下来。
I want to make an early start in the morning.
我想早上早点出发。
What time do you usually wake up in the morning?
通常你早晨几点钟醒？
It's a bit much calling me at three in the morning.
凌晨三点钟打电话给我，太过分了。
Traffic reaches its peak between 8 and 9 in the morning.
上午8、9点钟之间是交通高峰期。
It was ten in the morning but the curtains were still drawn.
已是早上10点钟了，可窗帘还拉着。
She used to work at her laptop until four in the morning.
她从前经常用手提电脑一直工作到凌晨4点。
Take the money to your office without fail, first thing in the morning
早上第一件事是一定要把钱拿到办公室去。
二、on the morning的意思及双语例句
on the morning意为在早上，表示具体某一天。
例句：We got the news on the morning of the wedding.
我们在举行婚礼的那天上午得到这个消息。
It was bedlam at our house on the morning of the wedding.
婚礼的那天早上，我们家闹哄哄的。
The battle started on the early morning of the 24th.
战斗是在24日凌晨开始的。
He's been on the computer all morning, chatting with his friends.
他整个上午都在上网和朋友聊天。
I saw her on the bus this morning, but she totally blanked me.
我今天早晨在公共汽车上见到她，但她连一眼都没瞧我。
