Is it ok to leave out the relative pronoun here?
ok, I think now I can say that this is a recurring issue for me..
would it be grammatically ok to omit "they" in the following sentence?
a part of me tells that I shouldn't but ... still, to my ears it doesn't sound THAT bad..? can anyone pls help?
thanks :) :)
"For best results, Invisalign® trays should be worn for twenty to twenty-two hours a day, and they have to be changed approximately once every fortnight."