...that it's red? (my silly comment is supposed to indicate that I'm surprised to find this sentence in the section about colours).
Are you sure it is in that section or are you doing "Strengthening" which can join different lessons together?
I don't remember that now :-)
I am doing this in the "present" section.
It's not just the section, but the sentence sounds as unfinished in Romanian as it does in English. That verb begs for a direct object.