Our two players agree on the following pattern. The server serves from the duece courts at the “T” , the returner plays his return (backhand for the right-hander) to the middle. Then the server uses his forehand. From here the point could be played out. But it can also remain in this closed situation, and this situation is simply repeated many times, and then after about 10 serves the roles are reversed.

Note:
Practicing agreed-upon patterns are an excellent precursor to practicing tactics and transitioning from using technique to acquiring it.