Student or Learner
I always confuse with these three terms : task, job and work. Could you please explain to me the differences between them?
I'm doing a job now, please call me later.
I'm doing a work now, please call me later.
I confuse which one is correct and which one not.
Don't say "a work" unless you are talking about musical compositions.
I'm working now. Please call me later.
A task is one thing you need to do. It can be take the dog to the vet, buy stamps, draft a report for work, or return a phone call.
The word "job" does have one meaning that can apply to what you wrote. Someone who works as a handyman, for example, might have "a job" in the sense that it means one customer who has asked him to do one thing. "I have a few jobs out in your part of town on Monday; I might be late, but I can stop by after I finish them up." Otherwise, your job is what you do for work. I am a business writer. She is a doctor. He is a teacher. That is their job.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.