Eh ... the problem with pronouns in English, is that except for the occasional simplistic conversation, you can never be certain what a pronoun is referring to -- it is inherently ambiguous, and requires a lot of fuzzy logic inference based on context.
For example: in the line i just wrote, what is "it" ? ... you as a person understood that "it" was a back reference to "a pronoun" (and not "English" or "simplistic conversation") but if you can write software smart enough to infer context like that -- there are a lot better uses for it then the perl compiler.
Frankly: I don't want source code to read like English -- English is messy and confusing.