How to properly use 了(le) to indicate COMPLETION OF ACTION | Essential Chinese Grammar

[@Amat3422]

Excellent.

[@emilyg90]

Great lesson! What a beautiful backyard!

[@yucao9767]

Love your class!

[@marcoco119]

I like your video!!!

[@kkkk1689]

Awesome！！！

[@TC-kn9kk]

美女非常可爱 ：) 加油

[@keystochinese0921]

谢谢你的鼓励～

[@shengxu4996]

Question🙋🏻‍♂️ Once my high school teacher yelled at me, “Hey Yanzu! Stop 瞎了了 in the class!” May I ask what 了了 means? It would be much appreciated if you could shed some light on it.

[@goldtheone]

.... and she didn't