If people eat too much, they feel/get a stomach ache. [type 0 conditional] If I spoke English fluently, I would find a good job. [type 2 conditional] If I don't pay my bills, I will have problems with my bank. [type 1 conditional] If you sit in the sun for too long, you will get a sunburn. [type 1 conditional if "you" is a specific person] If we hadn't worn masks, we would have gotten the coronavirus. [type 3 conditional] More information: https://www.ef.com/wwen/english-resources/english-grammar/conditional/