it was the postman 为什么用it?this time it was the postman and he was wanted meto sign for a registered letter

it was the postman 为什么用it?this time it was the postman and he was wanted meto sign for a registered letter 新概念2中第54课中的this time it was the postman这里为什么用the?应该用a呀,这里的“postman”是第一次出现! 翻译：the dog was a better postman then l was 英语高手们,（回答快的,）（废话别说!）1.Why the door of the letterbox was opened when Tom found it?)A.The postman forgot to lock it.)B.It was often opened.)C.Tom opened it.)D.The postman had no time to lock.)2.He does his homework at When / (Just) as I was leaving the house, the postman arrived.能不能用WhiIe I was leaving the house, the postman arrived. As my father was leaving the house,the postman arrived.这个句子能不能把改成这样呢?As my father left the house,the postman was arriving when I was leaving the house .the postman arrived.(变为同义句） jusy as we were leaving ,the postman (knocked/was knocking) at the door There is someone knocking at the door.It may ________ (be) the postman.如题 As my father was leaving the house,the postman arrived上面这句话可以写成这样吗：As my father was leaving the house,the postman was arrived.能不能加was啊,意思有变吗? postman are you 后面跟a postman还是the postman He was just an ordinary postman.Day after day,he shuttled(穿梭) back and forth across the village.For him,life was without waves.　　One day,he was delivering mail as usual.When he looked up in the sky,he suddenly lost his balance.It was a little It___be the postman at the door.It's only six oclock.这里为什么要用can't?---Have you seen the film Under the Hawthorn Tree?---Of course,I have.It was in our village ___it was made .这里为什么要用 that? was doing 比如说,As my father (was leaveing) the house ,the postman (arrive) 第一个括号里为什么要用 was doing What's a letter box?It's a box with a hole through which the postman puts the letters.我大概知道这题是要做什么 可是为什么是这样做呢? when I was having supper,the postman arrived这句话有错吗,如果错了请改正. 英语翻译It was the old lady's birthday.she got up early to be ready for the post.form the second floor flat could see the postman when he came dowm the street,and the little boy from the ground floor brought up her letters on the rare occasions w