Valid/Invalid shortcut

4everchasing

I've studied the valid/invalid arguments and though it's almost down, I sometimes still have mix-ups. I'm wondering if it's a good steadfast rule that, most and some only allow you to draw valid inferences if they occur first, then all the relationships following are "all" relationships?
ex. A some B ---> C

Is this a rule that works every time? If so, are there any other simplified one liners to help internalize?

Thanks all!