singal light do not work but all the other lights work and we teyed every thing and nothing works what can i do
Are the brake lights functional but not the signal lights? That is strange. I would have said it was a fuse but usually the brake lights and signal lights are tied to the same fuse so I don't think thats the issue. Check the fuses to be sure but I don't think it's the fuses. It could be the wires going to the signal lights. Could be that there is just no signal getting to the blinkers (meaning the issue is in the lever you pull to activate the blinkers.) Quite a pickle! I'd give a quick call to a Chevy dealer or get a Chilton manual to try and diagnose the issue.
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