Scientists have already made robots to walk and dance 改错

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• Scientists have already made robots to walk and dance 改错
• Japanese companies have already made robots walk and dance.中为什么有个have?是什么时态,
• Some scientists have already made robots walk and dance.为什么要用 walk and dance?
• Japanses companies have already made robots walk and dance . This kind of robot will also be fun to（接上）watch.问题1：前一句说：日本公司已经制造出这类机器人了,那为什么在后一句中,又要用“will"将来时态呢?问题2：robot为什么不用复数,这类机器人 应该有许多个的啦,就应该要用复数形式啊?
• Japanese companies have already made robots walk and dance.中为什么有个have?是什么时态,
• Some scientists have already made robots walk and dance.为什么要用 walk and dance?
• Japanses companies have already made robots walk and dance . This kind of robot will also be fun to
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