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.... ... ...关键词：They were young PPT课件免费下载，.PPT格式； 本作品中主体文字及图片可替换修改，文字修改可直接点击文本框进行编辑，图片更改可选中图片后单击鼠标右键选择更换图片，也可根据自身需求增加和删除作品中的内容，源文件无水印。如认为该内容涉嫌侵权，可通过邮件提出书面通知，我们将及时处理。