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Dear teachers,
Please help me understand the use of UNTIL NOW.

Situation1: I sent an e-mail to my boss a week ago asking about why I haven't received my bonus as promised.My boss keeps silent and now I have not received any reply from him yet .I am very upset.so now I say to one of my friend:

I will send him another email asking him why he has not answered my email yet/until now/so far

Situation2: sent an e-mail to my boss a week ago asking about why I haven't received my bonus as promised.My boss didn't answer my email until just a few minutes ago .He should have answered me earlier . He did answer me, but it is too late now.
so now how can I say?Can I say to my friend as follows?:

I will send him an email asking him (my boss) why he has not answered my email until now.
(not:why he has not answered my email sofar/yet/as yet)

Thank you in advance
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TuongvanSituation1: I sent an e-mail to my boss a week ago asking about why I haven't received my bonus as promised.My boss keeps silent and now I have not received any reply from him yet .I am very upset.so now I say to one of my friend:

I will send him another email asking him why he has not answered my email yet/until now/so far
Dear Boss - Why haven't you answered my email yet? (I have not received anything..)

Situation2: sent an e-mail to my boss a week ago asking about why I haven't received my bonus as promised.My boss didn't answer my email until just a few minutes ago .He should have answered me earlier . He did answer me, but it is too late now.
so now how can I say?Can I say to my friend as follows?:

Dear Boss: Why didn't you answer my email until just now? I needed it yesterday, and now it's too late.

I will send him an email asking him (my boss) why he had not answered my email until now.
(not:why he has not answered my email sofar/yet/as yet)
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Thank you AlpheccaStars,
But Could you please clarify why you use the past perfect rather than the present perfect here?:
Dear Boss: Why didn't you answer my email until just now? I needed it yesterday, and now it's too late.

I will send him an email asking him (my boss) why he HAD not answered my email until now.
(not:why he has not answered my email sofar/yet/as yet)

How about the following sentence?
I have never been happy until now

Does this mean that in the past I was not happy and now I am still unhappy ? or does it mean that in the past I was not happybut now I am happy ?

Thank you in advanve
No I thank you for your explanations.

yours friend
Rose