How long has it been since.这是什麼用法 意思

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• have been study 为什么不说have studied ,have been absent 为什么不说have absented1 have been study 和 have been absent最常见到,既然不是被动语态（主语是人）,为什么不直接用have + 动词过去分词的形式呢?2 have absented 我也看到过 不知道和have been absent 有什么区别（study和absebt在这都不做动词用了这我知道,我就是不知道为什么要这么用,是习惯用法吗?）3 另外 how long has she been study与 how long has she been studying只有语境上去区别对吧,意思都是一样的,用studying强调还会继续学习下去,但是study在这也暗示会继续学习下去吧.
• 有6题有关for及since用法,帮我看一下好吗?1.She has studies English 【for】three years .2.He has been at the hotel 【since】yesterday .3.She has lived in Brazil 【for】a long time .4.He has taught Italian 【since】last September .5.He has had a cold 【for】four days .6.They have been friends 【since】six years.这是我自己写的,不确定是否正确 = =可不可以加一个翻译,顺便告诉我 我写的对不对呢?!呵呵,不好意思,我英文很烂 ...
• How long has it been since.这是什麼用法 意思
• How long has it been since.这是什麼用法 意思
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