Questions & Answers about Kallaðu á mig ef þig vantar hjálp.
Kallaðu is the singular imperative of kalla. In other words, it is the form you use when telling one person to do something: Call!
The ending -ðu is a very common way to form the singular imperative of many Icelandic verbs, especially weak verbs like:
- tala → talaðu = speak
- hugsa → hugsaðu = think
- kalla → kallaðu = call
If you were speaking to more than one person, you would usually say kallið instead.
Because kalla á is a very common fixed expression.
Here, kalla á mig means something like:
- call to me
- call for me
- call on me
So it is best to learn kalla á as a unit.
That matters because kalla by itself can mean other things too, such as to call/name someone. For example:
- að kalla einhvern Jón = to call someone Jón
But in your sentence, kalla á mig is the helpful phrase meaning get my attention / call for me.