class control. how to control uncomprimising children?

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Presently i'm an English teacher in China. I teach kindergarten and in the evening i teach primary school children,i use flash cards, real materials to teach the kindergarten and the period per each lesson is 40mins, the first 15mins i'm able to get their attention and afterwards even if i try to play games with them, i'm not successful because the chinese teacher will not help. i can't also shout at them. i can only persuad them and that makes things worse because one: they don't understand me, two they don't even sit to listen but run about. when i try to teach them action language they do their own things. The evening class, here time given is 1.50hrs. they too after 20mins they just wouldn't listen but run about until the chinese counterpart comes to quiet them. I want all to share their oponions as how to control them and the more effective way to execute the lessons. it's on spoken English.