一番よく使われている表現はAfter he finished schoolです。
この2つの表現は同じ動詞が異なる時制で使われています。“After he finishes school”は未来に起きる出来事についての話で、 “After he finished school”は既に起きた出来事についての話をしています。
After he finished school, we'd meet in Central Park.
Your father started teaching after he finished high school.
I trained newly blind people for ten years after I finished school.
I was going to take Regan to Europe for a while after she finished school.
And when he finished school... deserted you and went home.
What did his mother do with her days after he finished school and went to college?
After they finished school, they all went their different ways to live their own separate lives.
What did Charlie do after he finished school last spring?
Maybe he plans on taking up prizefighting after he finishes school this year.
Just after he finishes talking to my daddy, I guess.
Charlie and I are going camping tomorrow at Juniper Park after he finishes his shift.
Yeah. Right after he finishes everything on the bride's to-do list.
And Nurcan's going to work when she finishes school.
I don't want Travis to be one of those kids that who, after he finishes school, just sits around doing nothing, waiting for his dream job.
Twenty minutes later, he finishes photographing the bedroom.
After he finishes grad school, he will work as a mechanical engineer at a company in Spain.