Using PowerPoint to offer free lessons on learning German verbs can keep your attention and the students' attention. This aspect of language teaching does depend on the equipment available in your classroom as well as your proficiency with the program; those teachers who have the computer set-up who don't know PowerPoint can often learn enough to use prepared lesson slides quickly.
One quality free resource is "German at pppst.com." This web site offers several innovative PowerPoint presentations--some with animations--that can help teach your students multiple aspects of German verbs, vocabulary words, and grammar.
If you'd like to also teach your students a bit about the actual country of Germany, "German at pppst.com" also features a free presentation of historic, cultural, and geographic facts.