{{Grammar Box}} The 了 (le) particle is used in many different ways. In this article, we will explore how to use the double 了 (le) to express the duration of an activity that is ongoing. == Ongoing Duration with Simple Verbs == Expressing [[Expressing duration with "le"|''how long'' you did something in the past]] is one thing, but what if the action is still ongoing? A clarifying example (in English) is appropriate: * I lived in Shanghai for 5 years. (concluded, not ongoing) * I have lived in Shanghai for 5 years. (mostly likely ongoing) * I have been living in Shanghai for 5 years. (definitely ongoing) This article is about expressing the third situation above, the one which is ''definitely ongoing''. === Structure ===