外研版四年级英语下册《They were young》PPT免费下载，共17页。
认识新单词
wasn’t = was not
不是
weren’t = were not
不是
clean干净的
dirty脏的
They are old now.
They weren’t old then.
They were young.
It is clean now.
It wasn’t clean then.
It was dirty.
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关键词：They were young PPT课件免费下载，.PPT格式；