evening

　　② 在特指的某天或某天的上午、下午、晚上前用" on " . 如： on a cold morning; on Sunday; on Saturday afternoon; on November 12th

　　③ 在具体的时刻前用" at " .

如：at half past ten; at 2 o'clock

典型例题：

　　① Your uncle is leaving for Ji'nan Sunday morning.

A. in B. on C. for D. at

　　② He learned English four years.

A. in B. on C. for D. at

解析：①的Sunday morning是具体的一天早晨，所以用介词on. 选B. ②中的four years是段时间，因此要用介词for. 选C.

【随堂达标】

一、单项选择

1. -_______ are you staying there?

-Just for two days.

A. How often B. When C. How long D. How many

2. I have _______ to tell you.

A. anything exciting B. exciting something

C. exciting anything D. something exciting

3. -I'm going to Tibet next Monday.

-_______.