You’re close, it’s I know. Saber is to know. Comprender and entender are slightly easier to conjugate because saber is irregular:
I know - yo comprendo - yo entiendo - yo sé
You know - tú comprendes, entiendes, sabes
He/she/it knows - el/ella comprende, entiende, sabe
They know - ellos/ellas comprenden, entienden, saben
*linguistic tidbit- ‘you’ is the formal version of ‘thou’. So while Spanish uses tú informally and Usted formally, modern English only uses the formal, contrary to popular belief.
Sí.
You’re close, it’s I know. Saber is to know. Comprender and entender are slightly easier to conjugate because saber is irregular:
I know - yo comprendo - yo entiendo - yo sé
You know - tú comprendes, entiendes, sabes
He/she/it knows - el/ella comprende, entiende, sabe
They know - ellos/ellas comprenden, entienden, saben
*linguistic tidbit- ‘you’ is the formal version of ‘thou’. So while Spanish uses tú informally and Usted formally, modern English only uses the formal, contrary to popular belief.