《Unit 2 Travelling Grammar 2》
课前自主学习目标:for 和since 的区别
试分析下列句子中的for 和since有什么区别：
You have lived here for 12 years.
You have lived here since 12years ago.
总结：____________________________________________
是翻译下列词组：
for 20 minutes
since 20 minutes ago
for 6 months
since 6 months ago
课堂活动展示：
用for 或since 填空
