seen是see的过去分词,那saw是?

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• ——Where is Alice?——I think she is in the dormitory.I saw her __接着 ：(pass) our classroom just now .② We must keep the classroom ____ (clean).Because we're going to have an English party tomorrow.都是根据 适当形式填空其实挺简单的就是忘了知识点 不知到底是 see sb to do sth还是see sb do sth ② keep sth clean 还是keep sth to clean还是 keep sth cleaning
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• 为什么he said,''did you see him last night变为he asked me whether i had seen him the night before为什么改成 whether i had seen ,had是怎么改的?seen是怎么改的
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• 动词的过去分词可以做非谓语动词 那可以做动词吗 好像done一样 是动词和形容词吗
• the man put on his glasses in order to see more clearly 这里的put on是动词短语做谓语动词吗,如果不是那 on是做什么成分,是副词吗
• 现在完成时与一般现在时加频度时间副词时的区别?现在完成时和一般现在时一样可以加频度副词,那么他们的区别在哪?比如说“我经常在公园看见他.”英文怎么说?是“i often see him in the park.”还是“i have often seen him in the park.”或者两者都可以?有什么区别?另外,they have always answered my letters.可以用they always answer my letter.为什么?
• 我从未见过这样的动物 为什么是I never saw such an animal 而不是I have never seen such an anima...我从未见过这样的动物 为什么是I never saw such an animal 而不是I have never seen such an animal 把never 提前为什么是Never did I see such an animal 为什么不是Never have I seen such an animal 不是在过去发生的对现在产生影响了吗？过去没见过，现在见着了，产生了影响。
• We've run out of money(这里've是什么的缩写,如果是have,怎么还能和run(动词原形)连用have+v过去分词,是让某人做某事的意思,那这个句子怎么翻译啊
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