What to do if I cant finish work & how to have effective voice out to my superior?

Answer 1

Instead of saying "I can't do it", ask for a prioritization - I can lick the stamps or seal the envelopes, which is a higher priority? That way, you're telling the supervisor that you can't do both without actually telling her that you can't do both -

Second option - ask supervisor if you can borrow Suzie for 3 days to lick stamps for you - that way, you already have a solution in hand.

Answer 2

Some people can do it