there have been great changes in computers什么意思

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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
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• 同义词、句 下列句子的同义句 1 Amy had a great time at Water World.Amy at Water World.2 My brother同义词、句 下列句子的同义句1 Amy had a great time at Water World.Amy at Water World.2 My brother is good at piaying footboll.My brother piaying footboll.3 Have you heard of Bali Have you Bali 4 I' ve been learning to darw since three years ago .I' ve been learning to darw .5 Could you please help me open the door?me open the door?6 There are over two hundred teachers in our school
• “There has been great changes in computers in the last few year”为什么是 has been不是have had
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• 看语法书看到动词的完成时 讲到主语第三人称单数+has+过去分词+.例句是 He has been to the Great Will 我看到这里完全懵了 别人说是Be的过去分词 但是我实在不明白 has been到底是什么意思 刚刚百度 有人说是 去过的意思 但是这个例句不表示去过吧?He has been busy since then.希望英语达人解释下!还有,说be动词的过去式,是类似于 He is 变成He was这样吗?那个be是系动词还是助动词啊?
• There have been great changes in computers(同义句）Great changes have __ __in computers
• There have been many great changes in our city____（最近几年）