to do sth不定式表目的
和for是一样的~！！
i come down to have diner
i come down for diner
for sth
to do sth
He is friendly to us.
He is friendly to us.
to 强调人与人的关系
for 强调作用
如：Eating more vegetable is good for us.
to
he is friendly to us
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