本影片所學為時間子句-When I，透過Joe寫給Mary的一封信為情境帶入課程，說明When句型架構為When Event 1, Event 2，且當中所敘述的Event 1及 Event 2是同時發生的。句子所表達的意思為當…的時候，例如When the wind blows, the kite flies.／When you show up, all my troubles go away.／When Mom came home last night, she brought me a cake.。此外，我們也可以將句子的結構改為Event 2 when Event 1.，例如The kite flies when the wind blows.／All my troubles go away when you show up.／Mom brought me a cake when she came home last night.。