What is the root or base illegal

The root word for the word illegal is legal. Notice the prefix il- in illegal. Prefixes are words, letters or some numbers that placed before the word itself. In this case, il- is the prefix of illegal, which means not acquired or done in a moral or official manner contrary to legal, which is the opposed definition of illegal. Examples of prefixes include, re- in remake, re-establish, retake. Notice the root words, make, establish and take in the given words.  

Nachna najanne agan tedho bhanejhai सिता lai राम्रो अक्षर लेख्न आउदैन तर उनी कलम lai दोष दिन्छन्।