为什么This is book （这是本书）用可数名词修饰是可选择用a an 为什

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• 为什么This is book （这是本书）用可数名词修饰是可选择用a an 为什
• 提一些英语问题It's twenty years he came to work in this school.A.that B.since 答案是B,为什没不选A?Stephen Hawking stressed to the interviews that his accomplishments would certainty have been achieved by others, A.never had he lived B.had he never lived C.he had never lived D.never had he lived为什么选B?这句话又如何翻译?Little i known when i took the trip where it could lead me.为什么用did不用had?He did not teach himself to paint he was in his twenties.这是一道填词题,我写的是before,答案是until ,不
• 英语翻译现在完成时和现在完成进行时感觉表达的意思差不多,现在完成时有些强调时间长度,而现在完成进行时有些强调动作.有句翻译题“那本书你读了多长时间了?读了多少页?”这句翻译我自己写的是：How long have you read that book?How many pages have you been reading?可是答案用的时态跟我的正相反,How long have you been reading that book?How many pages have you read?这是为什么?是不是这两种写法都行呢?
• what was she wearing?She wore a yellow and blue T-shirt 问句是过去进行时 回答却用了一般过去时 为什这是小学英语六年级下册的story time 中的句子I lost my friend at the museum.What's his name?Her name is Zip.How tall is she?I think she's 55cm.She's shorter than me.What was she wearing?She wore a yellow and blue T-shirt .那为什么问句要用过去进行时呢?问句 和回答 时态应该相照应啊 当然policeman 问zoom的时候 是指他的朋友走失的时候 穿的是什么衣服,,走失发生在问之前,应该用过去时态,,是不是既可以用一般过去时 What did she wear?也可以用过去进行时
• 英语的练习答句是1.I clean the room on Sunday
• 已知二次函数y=a(x+m)²+k的图像的形状和大小与抛物线y=-1/2（x-4)²相同,