Kann Man sagt "Guten Tag zu Alles" to mean the he is saying good day to all in a group.
4 Answers
I find the usual way to be just
Hallo
while looking at everybody in the group.
If you want to emphasize that you really greet everybody, you can say
Hallo zusammen
Which I (North German) find more common to say than
Hallo alle miteinander
which feels slightly outdated to me, but still works.
Of course you can replace Hallo with Guten Tag.
answered Feb 29, 2020 at 10:06
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1My first German manager used to write "Hallo zusammen". Which when she wrote in English she would always directly translate to "Hello together", which always made me chuckle! (Which is probably why I never corrected her!) Commented Mar 2, 2020 at 9:43
The Nominativ case, as suggested by πάντα ῥεῖ and infinitezero, is one (natural) option.
However, there are others. It's possible to use Dativ (whom do you wish a good day?):
Guten Tag Euch allen!
(...) allen Anwesenden einen Guten Tag.
If you use the right preposition, you may even use Akkusativ, e.g.:
Guten Tag an alle!
answered Feb 29, 2020 at 12:39
Kann Man sagt "Guten Tag zu Alles"
That's wrong in many ways:
Kann man sagt muss Kann man sagen heissen.
zu Alles cannot be used to refer for a group of people.
The usual way to say that in German is
Guten Tag alle miteinander.
You could also say "Guten Tag allerseits".
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That's a good solution. It is not too casual, but also not too stiff. Commented Mar 2, 2020 at 12:04