For examples:
I have lived in this apartment for two years.
I have lived in this apartment since 2012.
Can I combine this 2 sentences to
I have lived in this apartment for two years since 2012.?
Do people say like this?

I think I have lived in this apartment for two years since 2012. can convey for 2 years and also help listener know exactly since which year.

“He constantly laughs in class"
"He is constantly laughing in class"

“You are always forgetting about meetings" and "You always forget about meetings,"
Udemy instructor said using one
of the v-ing forms when meeting a always/constantly habits.

Are they all correct?

Good night

Good midday 12:22 😄

I’m fat ***😁