のこしたそうだ
tabenokoshita sōda

Godan Verb (su)
Evidential Auxiliary

Expresses hearsay about a past event ("I heard that...") of 食べ残す

1. They say (he/she/it) left food uneaten.; It seems (he/she/it) didn't finish (their) meal.

Past/Perfective
Hearsay Evidence