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"LOSE" and "LOOSE"
"Lose" means to fail to win or misplace. "Loose" means not tight or free. Ex.: I don't want to lose my keys. The button on my shirt is loose.
"IMPLY" and "INFER"
"Imply" means to suggest indirectly. "Infer" means to deduce or conclude from evidence. Ex.: Her silence seemed to imply disapproval. From her reaction, we can infer that she is unhappy.