"אני לא חותם, תודה."

Translation: I am not signing, thank you.

[ArianaClavenna]

As in sign language?

[dutchie451165]

no, as in signature

[misterram]

No, as giving your autograph (=חתימה)

[NaftaliFri1]

As in putting on a seal

[metasj]

Can't most of these sentences be translated as the immediate future as well? "I won't sign"

[NaftaliFri1]

Yes, as can the progressive variation in English. That's why we stick to the present.

[menorah84]

The offer is not enough

[hearttolearn]

why don't they let me say "won't"?

[TeribleT]

I think because of the tense. "Won't" implies that in the future you "will not" do something. I am not signing implies you are in the present, currently not doing something. https://english.stackexchange.com/questions/20491/wont-vs-wouldnt

[Krile1]

And "I don't sing" is wrong?

[Krile1]

I just saw it's not sing, but sign :-))