my father keen on researching our famiy history是什么意思

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• my father keen on researching our famiy history是什么意思
• My father keens on researching our family history.
• my father keen on researching our famiy history是什么意思
• 1,Finally,my father asked the waitrss pass by our table.为什么答案是把pass改为passing,说是分词短语作后置定语.可不是ask sb do/或者to 2,This is one of the methods （by which ）the history of people is passed on from generation to generation.为什么是By which,先行词是不是可以关系副词由介词加关系代词替换,那改为关系副词是什么呢?
• My father keens on researching our family history.
• Leaves usually ____from the trees in autumn.(f _ _ _ _)
• Flying kites is my favourite .为什么用Flying