Learn how to make a Dutch sentence negative, place the negative word correctly, and say already, still, not yet and no longer.
Ik werk niet. (I am not working.) Ik heb geen auto. (I do not have a car.) Dutch uses niet to deny an action, description or another part of a sentence. The word geen stands before a noun when its positive sentence would use the article for "a/an" or no article. The position of niet changes what the speaker denies: the whole statement or one particular part. The phrase nog niet (not yet) means an expected event has not happened. The phrase niet meer (no longer) means an existing situation has stopped.
Read niet or geen? first, because that choice shapes most everyday negative sentences. Continue with the position of niet to see how its place changes when a verb stands at the end and when you deny one particular part. Finish with al, nog, nog niet and niet meer to distinguish already, still, not yet and no longer.