Begin an activity: 開始 opens onto the verb that names what starts.
字源 FORM what the parts do
Two hands lift the bar out of the double door (開) — the gate swings open; 始 sets the first moment. The verb sits after the pair, and it is the thing coming through the open gate.
故事 STORY a scene to remember it by
The doors swing open and the activity walks straight through the gap.
字源記憶法
框 · Frame
[subj] (time) 開始 [verb phrase]
觸 · Trigger
An activity is getting under way and you want to name the moment it does.
序 · The move
1name the actor, and the time-point if there is onedoes the time sit before 開始, not after?
2開始 + the verb phrase of the activityis what follows a verb (the thing that begins), not a noun or a time?
3leave the verb to carry onis this an activity getting under way, not one already finished?