This was part of a discovery for Past Perfect.
I boarded these two sentences from and drew two timelines. The students had to complete the timelines with initials representing actions from the sentences.
This wasn't very easy to grasp for the students especially because some were convinced that "when" always means that two actions are simultaneous. That's why the timeline representing first sentences has the two demarcations drawn closer to each other than in the second timeline. I had to do a few more similar sentences with the timelines for students to understand this. Then I drew the first timeline on the board alongside the example sentence representing it. I erased the two demarcations in the past and drew them even closer to each other, erased "when" and elicited "as soon as" in its place. When they get the concept of these timelines it's very easy to play with them further and elicit other adverbs such as "before","after".