fail to do=?

fail to do=? fail to do sth=? never fail to do fail to do fail to do 还是fail to have done? We do not plan to fail we fail to fail in sth..fail to do sth.啥意思? fail to do和 fail doing有区别没? why do you fail to see me? often fail to do英文意思 fail to do sth与forget to do的区别 fail to fail to do sth和fail in doing sth的区别 fail to do与fail (in) sth有什么区别啊 fail的几种用法fail in sthfail in doing sthfail to do sthfail sth forget to do sth和fail to do sth 的区别当fail 也意为忘记,时 fail to do A or (to) do B这个结构是什么意思,改怎么用 pass sth to sb fail to do sth 这两个怎么造句啊?pass sth to sb fail to do sth