difference among 'duty', 'task' and 'assignment'

[Halil İbrahim]

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", question 6

Mario, that's great. I was thinking of asking you but I didn't want to take up your time. It's not a particularly easy ......... having to do this sort of homework and I'm not really keen on it, either.

(a) goal
(b) task
(c) effort
(d) role

Synonym Search, Intermediate level

ESL/EFL Test #125 "Synonyms for task and duty", answer 6

Mario, that's great. I was thinking of asking you but I didn't want to take up your time. It's not a particularly easy task having to do this sort of homework and I'm not really keen on it, either.

Correct answer: (b) task
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could you please explain to me 'assignment' with more example? what is the difference among 'duty', 'task' and 'assignment'. thank you. best regards

Halil İbrahim

[Conchita]

Most dictionaries give examples of the usage of words:

An assignment is something which you have been told to do.

A task is often a hard or unpleasant piece of work or study that must be done.

(A) duty is something we are legally or morally bound to do.