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教学目标：
1.能听、说、读、写词汇：heavy, last week, in front of, yesterday, lost。 2.能听懂和理解Let’s talk部分的对话内容，学习和掌握过去式中be动词was, were的用法。 3.能运用以下句型谈论物体过去和现在的位置： It was here just now. Oh, it’s behind the door. It was in front of the house yesterday, but now it isn’t there. 4.能正确理解、运用have to do something结构表不“不得不做某事”。