to know; to be aware (of); to be conscious (of); to learn (of); to find out; to discover ; to sense; to feel; to notice; to realize ; to understand; to comprehend; to grasp; to appreciate ; to remember; to be familiar with; to be acquainted with ; to experience; to go through; to know (e.g. hardship) ; to get acquainted with (a person); to get to know ; to have to do with; to be concerned with; to be one's concern; to be one's responsibility