i'm reading a newspaper ___ Mr Zhang is writing a letter

i'm reading a newspaper ___ Mr Zhang is writing a letter I was writing a letter ,He was reading a newspaper（用适当的连词连成一 I'm writing a letter I‘m writing a letter.改成问句 I'm writing a letter now Is Sarah reading a letter or writing a letter的意思是什么 mr grandfather is reading a newspaper 就划线部分提问.划线部分：reading a newspaper,mike,reading,is,a. He is writing a letter I am writing a letter. I`m (reading a newspaper.)[括号里提问) I'm (Writing a letter)划线提问 2Mr Brown comes from the USA（同义句）