Unit 6
When was it invented?
Grammar Focus

第一页，编辑于星期三：二十三点 三十一分。
Here is a big box .Fisher(费希尔〕invented it in 1901. It’ s very hard-working. It can make your clothes clean and your housework easy. With its help you can have more time to relax or to work.
washing machine
It is used for washing things.
Who was it invented by ?
It was invented by Fisher
When was it invented?
It was invented in 1901.
What’s it used for?
第二页，编辑于星期三：二十三点 三十一分。
fridge
Here is a big box. An American man named J ...