The perfect aspect/tense expressing that an action has been completed or that a resultant state holds (e.g. English present perfect: have + past participle). In Japanese grammar, forms like ～た or ～ている are sometimes discussed in relation to the perfect.
英語の完了形は have + 過去分詞 で表される。
The English perfect is expressed with have + past participle.
日本語で「食べてしまった」は完了形として解釈されることが多い。
In Japanese, 'tabete shimatta' is often interpreted as a perfect (completed) form.
完了形は経験・継続・結果などの意味を含むことがある。
The perfect can include meanings such as experience, continuation, or result.