What do you mean by ぁれば, なければ, すれば? It doesn't look like a hypothetical shape. Please give an example. thank you

I am a Japanese major. If I fully understand these four usages, I can't make it clear in a few words. These four are all hypotheses, but each has its own usage. The three words you said are the usage of ば, which means if you have it, if you don't, just do it.