I have been sitting in front of the computer for far to long, writing, and I am now having a mental blank about verbs ending with -ing. My girlfriend started this process by questioning some of my tense uses and now I don't know where I stand. So, if someone could put me back on the right track that would be great. My understanding is that by adding -ing to a verb it means the verb is being done at that moment. So, I often describe an action, then use a -ing after a comma to describe other actions being performed simultaneously. E.g. Is that correct? Or is there an tense issue when you add -ing to a verb? Thanks!