广州牛津初中英语七年级下U7现在完成时课件Unit 7 Language The Present Perfect TenseHello! My name is Helen!What is Helen preparing for?Helen: I have cleaned my house with my mother.She has cleaned her house with her mother.What is Helen preparing for?Helen: I have not bought enough foods and drinks. I will buy more later.She has not bought enough foods and drinks. She will buy more later.What is Helen preparing for?Helen: I have sent many i..