never know

• People never know to get away from them gracefully .
  人们素来不知道怎样从从容容地离去。
• The bus was moving so fast she never knew what hit her .
  公共汽车开得很快，突然把她撞了。
• His painting of people attained a level never known before .
  他的人物画在当时可谓登峰造极。
• He was filled with a fear such as he had never known .
  他内心里充满了一种他从未领略过的恐惧。
• I never knew anyone with so compassionate a heart .
  我从来没有见过那个人象他那样富于侠义心肠的。
• He never knew fear .
  他从来不知道害怕。
• She never knew which attraction made him decide .
  她真不知道，是哪一种吸引力，使他作出这个决定的。
• You never knew when you might stumble across some new talent .
  谁也说不准什么时候会碰上一位新的天才。
• You never know when you are victorious: that is a worse fault .
  你们从来不明白自己打了胜仗这是更大的缺点。
• I'm almost sure he had seen albie blast me but i'll never know .
  我几乎可以肯定他看见了阿比尔揍我，但又说不太准。