The question seems misconceived. ", but this implies that the speaker is dissatisfied that the task has not been completed. It doesn't make sense to follow it with "Good work.
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esalim80You mean, it is better to say ( Have you finished your task already?) not ( Haven't.......................already?)Haven't you finished your task yet? -- expected answer "no": the task should have been completed by now, but the speaker sees/expects that it has not
esalim80some other people said it is ( already) not ( yet ).Words you wish to highlight should not go in parentheses. You should learn to use quotation marks properly.