After hosting Japanese exchange students several times, I've notices that they ask permission for every little thing. Whether out of politeness or out of fear it is the wrong thing to do I am unsure; No matter how many times I explain to them that asking in unnecessary, they continue to do so. This time I wanted to be able to say "You do not need to ask permission, just do it" so that they are able to understand. I would grately appreciate if anyone is able to provide a translation.
On a side note please include the phonetic reading (How the words are pronounced).