新概念 1册 Lesson 69 We are standing on the left

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• 新概念 1册 Lesson 69 We are standing on the left
• 新概念英语第一册69课中语法新概念英语第一册69课中there were hundreds of people there.my wife and i were at the race.our friends julie and Jack ere there,too.you can see us in the crowd.we are standing on the left.there ere twenty cars in the race.we are standing on the left.这一句上下文都是用过去时.为什么这一句用现在进行时.thank you for your help用现在进与用过去时有什么区别呢？
• 关于DO的过去时态用法新概念英语第一册第73课里：Last week Mrs.Mills went to London.She does not know London very well,这里这个DOES不是说是现在时么?这里应该用DID吧另外好像之前的课文有提到动词后面加ED的但这一段：The he put his hand into his pocket,.He opened the book and found a phrase.不解的是PUT为什么不加ED?FOUND应该也要加吧.另外He read the phrase slowly还有69课中讲到他们去看赛车My wife and I were at the race.Our friends Julie and Jack were there,tooYou can see us in the crowd.We are standing on the left.最后一句不是现在进行时么？
• There were hundreds of people there.
• 长江哪个河段最易发生洪涝灾害