to be made和to have been made有什么区别

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• 一片英语科技短文的选择here have been many great inventions, things that changed the way we live in. The first great invention was one that is still very important today一the wheel. This made it easier to carry heavy things and to travel long distances. For hundreds of years after that there were few inventions that had as much effect as the wheel. Then in the early 1800's the world started to change. There was little unknown land left in the world. People did not
• 问个关于be made by与made by句型的问题be made by与made by有什么区别么,如果是be made by,那be是什么时态的,就好比The model car is made by him对还是The model car was made by him对.
• A:How long__in shanghai?B:For two week,i'm going to visit some schools in shanghai.A did you stay B do you stay C have you stay D are you staying为什么选择D项ABC项为什么错误啊~BC两项do和have有什么区别啊
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• 语法中,现在分词,过去分词作定语的用法!1-什么情况下分词不能与定语从句互换?我查到的例子中有这样一条规则：如主句谓语是现在时,从句谓语事过去时时.例如：The foreigner who visited our class yesterday is from Canada.(≠The foreigner visited our class yesterday is from Canada.)但是之后看的很多例句把这条推翻了,所以这条规则更详细一点说,是不是区别在延续性/非延续性动词上了?2-过去分词（不及物的）作定语表示完成,那么此时和现在分词的having done有什么区别?（除了having done不能作定语）,也就是说,过去分词表示的完成（have done）时态上怎么看?3很多语法书上写,特定的不及物动词可以有v-ed形式做定语,这个"特定"怎么定义?我怎么样就可以知道哪个可以哪个不可以?
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• 阅读短文,在空白处写出各单词的正确形式,单词的第一个字母已给出(初二)There have been many great inventions that changed the way we live.The f____ great invention was one that is still very i____ today----wheel.This made it e____ to carry heavy things and to travel long distance.For hundreds of years after that there were f____ inventions that as important as the wheel.Then in the early 1800's the world started to c_____.There was l_____ unknown land left in the world.People didn't hav
• 英语句子与语法请问I found something这句话对吗?如果正确,那这句话和i have found something有什么区别呢?
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