{"era":"current","word":"cannot","meaning":"am/is/are not able to","children":[{"era":"1300s","word":"can not","meaning":"am not able","children":[{"era":"pre-1100","word":"can","meaning":"to know how, to be able","children":[{"era":"pre-500","word":"*kunnan","meaning":"to know, to be able","children":[],"language":"Proto-Germanic"}],"language":"Old English"},{"era":"pre-1100","word":"not","meaning":"negation particle","children":[],"language":"Old English"}],"language":"Middle English"}],"language":"Modern English"}