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2) The use of “while”and “when”
Step 1 Lead in
postcard (n.) 明信片
receive (v.) 收到
2. 昨天他收到一张明信片。
He received a postcard yesterday.
1. Glad to receive your postcard.
很高兴收到你的明信片。
度假 on vacation
vacation（n.）假期
summer vacation
winter vacation
（同义词）holiday
Now I am on vacation.
现在我在度假。
Example:
Darren was having a class while Michael was climbing a mountain.
have a class / climb
run / swim
dance / sing
Step 2 Presentation
１．一般情况,直接＋ing 。
２．以不发音ｅ结尾，去ｅ＋ing。
３．重读闭音节(辅音字母加一个元音字母加一个辅音字母）结尾,双写最后一个辅音字母，再＋ing 。
running
dancing
swimming
singing
1
延续性