"I need to exercise more."
Translation:Jag behöver träna mer.
Everytime i leave out words like 'ar', 'med', or 'på' they say its wrong because in that instance i needed them in. But then everytime i leave them in, i get it wrong because i was supposed to leave them out...
What is the trick to knowing when to keep unimportant words like that in, and when to keep them out?