Learn Dutch: Ik help hem niet, omdat hij niet eerlijk is. - I am not helping him, because he is not honest.

In the main clause (Ik help hem niet), niet usually goes towards the end of the sentence. Specifically, it must come after a definite direct object like the pronoun hem (him).

In the second clause, why does niet come right before eerlijk?

Here, niet specifically negates the adjective eerlijk (honest), so it goes directly in front of it. Even though this is a subordinate clause, niet stays right next to the adjective it negates.

Why is the verb is placed at the very end of the sentence?

The word omdat (because) always starts a subordinate clause. A major rule in Dutch is that subordinate clauses push their conjugated verb (in this case, is) all the way to the end of the clause.

Why does the translation use "I am not helping" when the Dutch just says help?

Dutch doesn't use a separate tense for ongoing actions like English does with "am doing" or "is helping". The simple present tense Ik help translates to both "I help" and "I am helping", depending on the context.