feel certain

appreciate experience have learn notice perceive realize recognize see

apperceive apprehend cognize comprehend differentiate discern discriminate distinguish fathom grasp ken prize undergo

be acquainted be cognizant be conversant in be informed be learned be master of be read be schooled be versed get the idea have down pat have information have knowledge of keep up on on top of

ignore miss misunderstand neglect overlook

confuse mix up not get

be ignorant forget misinterpret