ている
te-iru
ている is not 'is doing'. It is a switch left on.
The picture A switch flipped on over the verb. Either it is still running, or it was flipped once and has stayed on.
Where the picture shows up in ている
-
still running
今、昼ご飯を食べています。
ima, hirugohan o tabete imasu
I'm having lunch right now.
-
left on for good
母は大阪に住んでいます。
haha wa ōsaka ni sunde imasu
My mother lives in Osaka.
Plain 住みます sounds wrong. Living somewhere is a switch that stays on, so 住んでいます is the normal form.
-
the result is still on
電気がついています。
denki ga tsuite imasu
The light is on.
-
a habit kept switched on
毎朝、六時に起きています。
maiasa, rokuji ni okite imasu
I get up at six every morning.
-
it became so and stayed
姉は結婚しています。
ane wa kekkon shite imasu
My sister is married.
結婚しました is the wedding as an event; 結婚しています is being married now.