Incorrect or Ambiguous Pronoun Reference

Incorrect usage with regard to kind of pronoun:

Examples:

1) You and me should go down to the river and catch some crawdads. "me" is not the subject form, yet here it resides in the subject position. 1) You and I should go down to the river and catch some crawdads.

2) Do you know who you are talking to, young man? Here the relative pronoun "who" is incorrect because it is the subject form, and the relative clause that includes it ("who you are talking to") already has a subject ("you"). One should change the relative pronoun to the object form ("whom"). 2) Do you know whom you are talking to, young man? If this sounds awkward, then another way to write this would be: 2) Do you know to whom you are talking, young man?

Pronouns need to correspond to the nouns (or other pronouns) that they refer back to.

Icorrect reference with regard to number:

Everyone should have their own beliefs about the sea gods even though this makes things very complicated.

"their" is plural and "everyone" (the word it refers back to) is singular. Therefore, you cannot have a plural pronoun referring back to a singular noun.

Everyone should have his/her beliefs about the gods even though this makes things very complicated.

Muffled reference:

The Co-op is sponsoring a seminar on how to prepare one's bodily tissues that are shed because they believe that sloughed off skin, fingernails, acne discharge and toe jam are a good source of protein that often goes wasted.

In this disgusting sentence the "they" does not refer back to any specific persons. It seems to refer back to the "members" of the Co-op, but these people are not mentioned. they are just inferred. This is called a muffled reference.

The members of the Co-op are sponsoring a seminar on how to prepare one's bodily tissues that are shed because they believe that sloughed off skin, fingernails, acne discharge and toe jam are a good source of protein that often goes wasted.

Ambiguous Reference:

The days are getting longer, but it's hard to tell where all this light is coming from.

Here the "it" doesn't seem to refer back to anything in particular. Certainly it isn't referring back to "days." the "days" aren't hard to tell (you should be able to substitute one for the other and have it make sense).

The days are getting longer, but the difficulty is telling where all the ight is coming from.