people in the west make_ a rule to buy christmas presents for their relatives and friends .people in the west make it a rule to buy christmas presents for their relatives and friends .此处为何用it

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people in the west make_ a rule to buy christmas presents for their relatives and friends .people in the west make it a rule to buy christmas presents for their relatives and friends .此处为何用it

people in the west make_ a rule to buy christmas presents for their relatives and friends .people in the west make it a rule to buy christmas presents for their relatives and friends .此处为何用it
people in the west make_ a rule to buy christmas presents for their relatives and friends .
people in the west make it a rule to buy christmas presents for their relatives and friends .
此处为何用it

people in the west make_ a rule to buy christmas presents for their relatives and friends .people in the west make it a rule to buy christmas presents for their relatives and friends .此处为何用it
it 作形式主语,真正的主语是后面的动词不定式.

it 是形式宾语,真正宾语是不定式短语 to buy christmas presents for their relatives and friends. 因为太长,所以放在句尾,而用It 放在句中代替。