GM doing all the work and tired of it!

[Quetzacotl]

Well, this might work in a Group where the DM can rule with an iron fist, but not in a harmonic group where all people get to decide and are equal ^^

this is the kind of behaviour that might end in a situation where you end up standing alone without a Group to play with...

[garhkal]

If they were a harmonic group, don't you think ALL would take the time and effort to learn the damn rules?
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Confucious sayeth, don't wash cat while drunk!

[Quetzacotl]

Well, the OP said, that they all have fun, only that two of them don't learn the rules.

Doing something like just killing the characters because they stand there like they're brain dead is the absolute worst thing you can do.

Out of game Problems should ALWAYS be solved out of game. Trying to solve an out of game Problem in of game, all you do is create distrusst, disharmony and discord (and probably some other d words ^^) and make people angry, which will lead in the end of the group. And I don't think that's what the OP wants. If he want's that, he could just stop GMing the game and thats it.

My advice:
Talk to them, tell them that you're unhappy with the situation and try to solve this as a group. A cheat sheet is already a got start and was already mentioned a lot, but you won't get around talking with them.
Just killing of their characters or something like that will only work for a very little group of people and will most likely destroy the group if the 2 persons are not part of that very little group, so I wouldn't go that way as long as you guys still have fun.

[DougRed4]

I've used something similar (albeit for a different game), and it's worked well.

When my players would become too focused on cross-talk or out-of-character discussions, or if they just plain weren't paying attention, I would switch to "Turbo Mode". With Turbo Mode, I would simply tell them it's their turn to move, and if their only response was a "Uhhhhhmmmmm...." for five to ten seconds, then I'd skip them and move on to the next character. I would usually allow them to jump in later (thus allowing them to "save" their action), but this generally solves the problem of people not knowing what to do when it's their action, which comes from the player not thinking about what he/she will do next when it was their turn (something we're probably all guilty of).

I've used this mechanic with great effectiveness, and it's not caused any hard feelings (though it is admittedly less harsh than letting somebody completely lose their turn or allowing their character to die as a result of their inattention).
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Currently Running: Villains & Vigilantes (a 32-year-old campaign with multiple groups) and D6 Star Wars; mostly on hiatus are Adventures in Middle-earth and Delta Green