not know

confuse miscalculate misconstrue misinterpret misjudge misread overestimate overlook underestimate

addle blunder botch bungle confound err fail goof jumble lapse misapprehend misconceive miscount miss omit slip snarl tangle

be off the mark be wrong deceive oneself get wrong have wrong impression make a mess misdeem misknow miss the boat put foot in slip up take for

understand

accomplish achieve clear up correct do well fix succeed uncomplicate

be certain be sure comprehend interpret perceive