Hi Ruben; I'm not sure what part of the sentence troubles you. To keep it simple, let's remove the first clause. There are many more things that could be said than we have space to discuss.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
RubenadriaanI do not know whether the imaginary emphasis is on 'could' or elsewhere:I don't think there is any emphasis on "could", imaginary or real, (or elsewhere).