Just now he ____ his dinner but he says he will see you when he's finished.

Just now, already, just, yet, recently, still ইত্যাদি শব্দ থাকলে সাধারণত present perfect tense হয়।

Structure: Subject + has/have + past participle + object।

Example: Meera has met her mother just now.

Complete sentence: Just now he has had his dinner but he says he will see you when he's finished.