Here is a worksheet on the Latin word root fid. It means faith, but as it made its way into English words, it began to connote “truth” as well. You’ll find this root in such commonly used words as confide, fidelity, affidavit, and confidant.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.