In a multiplayer game, a Terran structure can be built by an SCV. The worker must keep working at the structure until it is complete. After that, it can start doing something else.
Basic Structures
Basic Structures fulfill the essential tasks in StarCraft II. Whether you need to gather resources or train low tier units, a Bunker to defend your base or a Sensor Tower to predict your enemies' next move, these are the buildings you're looking for. If you need more advanced entities, have a look at the Advanced Structures.
Advanced Structures
Advanced Structures are the most important part of a longer game of StarCcraft. If you're looking for high firepower, flying units or specialists, access the Advanced Structures menu in your SCV's command panel and start showing off your combat expertise.
