将下列句子变成一般疑问句,并作肯定或否定回答。 1. He is Mr Black. _______________________________? Yes, ______________. 2. I am in Grade 1. _______________________________? No, ______________. 3. You are workers. ______________________________? No, ______________. 4. This is my book. _______________________________? Yes, _____________. 5. That is an English dictionary. _____________________? No, _____________.