In the junior highs I like to play Bombs Away which is just battleship. This is really just for practice and fluency. I assume they have already learned the grammar behind it.
www.mes-english.com/games/bombsaway.php
There is a passive sheet all ready to go. If you hear a lot of laughter, you know that they understand what they are saying.
For introduction I use my cards Susan53 linked to above.