the invention concerned comprises three components, and one of them is an elastomer which does not contain a functional group (4). I used this term "an elastomer which does not contain a functional group (4)" in claims as well, but now I'm a little bit confused because in Examples, it's basically a past tense and I'm not sure if I should change the tense of (4) (to "did" not) or not. I want to keep the term as it is because it is one element that the invention comprises, but should I change the tense? Or should I change the term (like, elastomer containing no functional group)?
Thank you so much for your help.