Ik bel mijn moeder op.

Breakdown of Ik bel mijn moeder op.

de moeder
the mother
opbellen
to phone / to call up

Questions & Answers about Ik bel mijn moeder op.

Why is the word op at the very end of the sentence?
It is the prefix of the separable verb opbellen (to call or to phone). In a simple present tense sentence, a separable verb splits. The main verb (bel) takes the normal second position in the sentence, and the prefix (op) is pushed to the very end.
Does opbellen mean exactly the same thing as just bellen?
They are very similar and often used interchangeably for phone calls. Opbellen specifically means to make a phone call, much like "calling someone up" in English. The shorter verb bellen can mean making a phone call, but it is also the word used for ringing a doorbell.
If I add more words to this sentence, like "today", where does op go?
It stays at the very end! No matter how much extra information you add to the middle of this main clause, the separable prefix gets pushed to the final spot. For example, adding "today" (vandaag) makes the sentence Ik bel mijn moeder vandaag op.
Why does the English translation just say "I phone" instead of "I phone up"?
While standard English translates it simply as "I phone" or "I call", English phrasal verbs like "call up" are the perfect way to understand Dutch separable verbs. Thinking of this sentence literally as "I call my mother up" is a great mental trick to remember why the op is there.

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