Basically, there are two bases, and you have to protect yours and capture the enemys at the same time.  

One team gets the flag, and they have to get the flag to a certain point, but the flag must be attached to a member of the team. They must get him to a certain point. The other teams objective is to, well capture the flag.

One person serves as the terminator, and everyone else is trying to kill the terminator. Here is where it get tricky, the terminator cannot be killed, but the other team can. The only way for the team to win is to make the terminator give up or scream out in extreme pain yelling "I GIVE I GIVE".