not fail to do sth.是''一定能做某事''的意思吗

not fail to do sth.是''一定能做某事''的意思吗 fail to do sth=? fail in sth..fail to do sth.啥意思? fail to do sth是未能做某事?还是失败做某事?有没有fail in doing sth? We do not plan to fail we fail to fail to do sth与forget to do的区别 why not后面是doing sth还是 to do sth fail to do sth和fail in doing sth的区别 是ask sb not to do sth 还是ask sb to not do sth to not do sth & not to do sth不定式的否定形式是 not to do sth.那么,to not do sth 有这样的说法吧.那 learn not to do sth 也是病语么?辛苦大家了..... forget to do sth和fail to do sth 的区别当fail 也意为忘记,时 pass sth to sb fail to do sth 这两个怎么造句啊?pass sth to sb fail to do sth 是tell sb.not do sth.还是tell sb.not to do sth.那么ask呢? 最好不做某事是had better not do sth 还是had better not to do sth 是Why not to do sth还是Why not do sth? 那个语法是why not to do Sth还是why not do Sth 动词+not to do sth 如 decide not to do sth ,try not to do sth fail to do与fail (in) sth有什么区别啊