Except for swarming, termites live in the ground, so they are never seen. What you may see are their mud tubes, small "sandy" looking tubes. They may appear at cracks in the concrete basement(?) floor, and at corners where wood members meet, maybe for the floor structure. Also, look closely around the foundation on the outside. If they appear every spring it's a very good bet that you have a good sized colony under your home. My recommendation is to call a small local "bug guy", don't get sucked into a multi-year contract, with "bait stations". If you have termites, have the ground treated, and it should be good for several years.
Used to be a home inspector/bug guy.