Well then, I guess I'll try to answer the question as best I can. And suppose, at least for the sake of argument, that I'm not trying to convince you that evolution is real, but rather, simply explaining what the theory entails. After all, if one wishes to debunk evolution, they ought to know what evolution actually is. The question "if we evolved from monkeys, why are there still monkeys..." presupposes a couple misconceptions about evolution. People who make this argument typically seem to think evolution means one species transfiguring into another, as if somehow one species were suddenly to start giving birth to another. Speciation actually occurs very gradually through a continua of genetic populations; every organism is the same species as it's parents and its children. But over myriad generations, small genetic distinctions can accumulate, such that the final member in a series of generations will be a genetically distinct species from its distant ancestors, even though at no point in the ancestral line did one organism produce offspring distinct enough to be a separate species. Again, it's about the small accumulation of changes over time, hence creating a continuum. Another example of this continuum principle is languages. Italian, for instance, is descended from Latin, but at no point in history could one say that everyone suddenly stop speaking Latin and start speaking Italian. It was a gradual process that made little or no difference in the scope of a few generations, but has a demonstrable cumulative effect when seen in hindsight after a long period of time. Another misconception some have about evolution, is the belief that we are descended from monkeys like the ones we have today, which is not the case. Instead, we humans and all other primates share a common ancestral species, which was not the same as any species we have today (nor a "hybrid" of them, as some people think.) Rather it was a basal primate species, from which one splinter population diverged into a lineage that would ultimately become monkeys, and another splinter population diverged into the lineage which ultimately became humans. In short, we aren't descended from monkeys; we and monkeys have a common ancestor which was neither a monkey nor human, or any other kind of great ape.
