Given that I have multiple pens (it could be any word instead of pen, just assume I have more than one of those).
Should I then plug a S at the end or no?
Given that I have multiple pens (it could be any word instead of pen, just assume I have more than one of those).
Should I then plug a S at the end or no?
It does not depend on the number of instruments you own. If, given the work you are doing with those instruments, it is clear that you need several (some sort of technical or artistic drawing, for instance), then when your words are to be understood in reference to this work, add an s. If it is clear that only one is needed, then use no s.