It was known to me that the work had been done by him
It was known to me that the work has been done by him
It is known to me that the work was done by him
It was known to me that the work was done by him
"He writes a letter" In this sentence "write" is a/an-
Intransitive verb
Auxiliary verb
Principal verb
Transitive verb
Acted
Enact
Action
Actress