The past tense of 'tutor' is 'tutored'. It is perfectly regular.
The past tense is tutored.
The past tense of paste is pasted.
The future tense is will paste.
He,she,it + pastes (Simple Present tense} I,we,they + paste (simple present tense)
Did not
The past tense is drank.
Correct
The paste tense is grew.
Loaned
Ran
The paste tense of clone is cloned
The word tutor is a noun. The plural form is tutors.