Hello!
I can't join you now I have not done my homework yet
---------------------------------------------------------------------------------------------
We need to use the correct form of the verb "do." In this case, since the action has not been completed yet, we should use the negative form of the present perfect tense, which is "have not done.
What is present perfect tense?
The present perfect tense is used to describe actions that started in the past and are still relevant in the present. It emphasizes the result or outcome of the action and is formed by using "have" or "has" followed by the past participle form of the main verb.