● at 8:00, at 10:30 ,at night, ....

● on Friday , on Friday night , on the weekend, on weekends , ...

● in October , in 2011 , in the fall , in the evening, ...

我們都記得什麼時候要加at / in / on

但在下列時間片語前面我們不用at / in /on ：

●this.....(this morning / this week 等)

What are you doing this weekend ?

●every.....(every day / every week 等)

●last......(last August / last week等)

We go on vacation every summer. Last summer we went to Europe.

●next......(next Monday / next week等)

I am leaving next Monday. (不是on next Monday )

同學們這樣明白了嗎？ ^_^