Chinese grammar: must not add 了1 - Youtube - Cchatty

must no add 了1 in the following 6 situations:

1, It can't add 了1 with these actions about habitual, frequent, or regular.
我每天七点起了床，八点去上汉语课。（X）
I get up at seven every day and go to my Chinese class at eight.
keywords: 每天, 每月, 每年, 每次, 每逢, 常常, 总是, 很少, 偶尔

2, It can't add 了1 after the verb "mental activity"
我喜欢了流行音乐。（X）
I like pop music. 
keywords: 爱, 喜欢, 打算, 希望, 决心

3, it can't add 了1 after a "modal verb"
我会了说汉语。（X）
I can speak Chinese.
keywords: 想, 会, 能, 要, 应该, 可以

4, It can't add 了1 after a verb that does not express the actions.
那时候他是了老师。（X）
He was a teacher at that time.
昨天我在了家。（X）
I was at home yesterday.
keywords: 是, 在

5, It can't add 了1 when there is an ongoing action or state.
昨天我一直在家等了你。（X）
I was waiting for you at home yesterday.

6, It can't add 了1 when the object is a clause or a verb-object structure.
我去年开始了学习汉语。（X）
I started learning Chinese last year.