Drone technology is <u>continually</u> being improved, and the cost of <u>buying</u> a drone is not <u>is</u> expensive as it <u>used</u> to be.

Drone technology is continually being improved, and the cost of buying a drone is not is expensive as it used to be. (*) used (*) is (*) buying (*) continually

This is a companion discussion topic for the original entry at https://english.best/questions/24939,drone-technology-is-ucontinuallyu-being-improved-and-the-cost-of-ubuyingu-a-drone-is-not-uisu-expensive-as-it-uusedu-to-be/