英语语法题：I did return to him为什么选did?

英语语法题：I did return to him为什么选did? 两道英语语法题1.Did you go to the cimama yesterday?----I'd love to How did Mr.Black return to Did I tip him big 英语语法题（36)Ⅱ"Jack,did you see all the acts?" "No,When I got to My mum did not -----home A return to B return What did the write give hin in return for him what did the writer give him in return for money ? what did the writer give him in return for this? what did the writer give him in return for money “What did your boss say to him?”中did可不可以去掉、say为什么不用said What did your boss say to him 中为什么不用do而用did?