English diary 4/21

It's a busy months.

It's been a busy month. - ( if the month was busy)

These few months have been very busy. - (if a couple of months have been busy)
I have dozens of work.

I have a lot of work.

I'am trying to finish my acrylic painting.
I'm or (I am) 

"Obsessed is a word that the lazy use to describe the dedicated."
This a sentence is written on the memo but I am not sure what it means.

This sentence was written on a (my) memo, but I'm not sure what it means. 

Hayden corrected the text so I'll just address the question you have about the quote.

"Obsessed is a word that the lazy use to describe the dedicated."

Both words, "obsessed" and "dedicated" in this context share a meaning that is "committed to a task."

However, "obsessed" has a negative connotation, whereas "dedicated" has a positive connotation. The phrase roughly means that "lazy people do not understand what it means to be hardworking, so they dismiss the hardworking people as excessive perfectionists"

懶到連"用功"和"痴迷"都沒辦法分別