In chessmaster11, how can I force the engine to
move,because sometimes it thinks over and over and I can't wait so much long. Could someone tell me how to do it? Thanks very much!

Ctrl+F


Of course you can only do it in training mode.

ebutaljib ,thank you for your reply.
So,as you said, in the "Ranking" mode and
"Tournament" mode I can't use "Ctrl+F" ??
In these 2 modes, must I wait the engine
patiently for its move??

Of course. Training is training, but rated games and tournament games are "serious business". You can't force your opponent to move, otherwise he could do the same to you