He is writing a letter____the corner.

He is writing a letter____the corner. He is writing a letter He is writing ________. He is p___ writing Mr Smith is busy now.He is writing a book He is writing a letter.（对a letter提问） He is writing a letter in his study. （否定） he is busy writing something on a pice of paper. look he is （writing） a letter to his he is writing a book .（改为一般疑问句） 用英语解释he is busy writing a job application He is writing a poetcard .(改为否定句）