Ikke comes AFTER the conjugated verb, not before it - Jeg arbejder ikke. That is the opposite of English, where "not" follows a helper verb, and it is the single most common word-order mistake beginners make.
Examples
- Klokken er ikke et endnu.
- It isn't one o'clock yet.
- Jeg arbejder ikke om søndagen.
- I don't work on Sundays.
- Nej, jeg taler ikke tysk.
- No, I don't speak German.
The mistake to avoid
"Jeg ikke arbejder" is wrong in a main clause - ikke goes after the verb.
Where this fits in
Numbers, days, time, Danish A1: Count, talk about days and months, give the time, and handle numbers in real situations.