know for certain是什么意思?

know for certain是什么意思? All i really know for certain i know i was wrong i know that for certain you know we belon Certain是什么意思? 关于副词 thereI know for certain that he's in there,but he won't certain materials是什么意思 certain animals是什么意思 certain flavours是什么意思 Certain|y是什么意思? for certain reason还是for a certain reason for certain=certainly吗? Know you for three months是什么意思