內(nèi)容導(dǎo)讀：
Unit 3 Period 2
What were you doing when the UFO arrived？
A： Where was the girl when the UFO arrived？
B： She was in front of the library.
A： What was she doing when the UFO arrived？
B： She was standing in front of the library.
What was … doing when I arrived at Ted’s？
Ted was sleeping late when I arrived at his home.
I arrived at Ted’s while he was sleeping late.
his brother was taking a shower.
his father was watching TV.
his mother was cooking dinner.
Think and compare
. The boy was walking down the street when a UFO landed.
. While the boy was walking down the street， the UFO landed
While the girl was shopping， the alien got out.
The girl was shopping when the alien got out.
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