"I am going to call my mother."
Translation:Ik ga mijn moeder bellen.
I expected there to be an '(om) te' before 'bellen', as in some previous examples. Can someone explain why it is not needed here?
You can only start to fill in om te if the words before 'om' forms a full sentence.
In your example sentence: ' Ik ga om mijn moeder te bellen', although the Ik ga forms a full sentence, the meaning translates to; 'I go' and it has nothing to do with 'I am going to' or 'I'll will', so you cannot use 'om' in this sentence.
Click here for more info.
For using 'te' there are six situations in which you can use it. You can see them here