ぼくするそうだ
boku suru sōda

Suru Verb
Evidential Auxiliary

Expresses hearsay ("I heard that...") of 牧する

1. I hear that [he/she/it] tends to...; I hear that [he/she/it] is in charge of...; I hear that [he/she/it] is taking care of...

Hearsay Evidence