what is a vague pronoun?

Your subject is English grammar.

A vague pronoun is a pronoun whose antecedent is not clear.

Check this site for examples.

http://owl.english.purdue.edu/handouts/grammar/g_pronuse.html

There is a pretty good short video lecture about the flagrantly vague pronouns at http://videos.howstuffworks.com/hsw/20288-english-grammar-6-vague-pronoun-references-video.htm

I also looked at some online examples including an essay at
http://www.cheathouse.com/essay/essay_view.php?p_essay_id=45564
and I do not agree with some of their examples. Sometimes the subject referred to by "it" and "this" in a sentence should be obvious and not have to be spelled out by making the sentence longer. It is a matter of style.

what is the present tense form of the verb to be in this sentence below

the competition date and the prize amount--- still uncertain

You should have posted this as a new question, not as a comment to a previous question.

The correct verb is ARE because the subject is plural

1A 2B 3BC 4 B you will get a 100 trust me

A vague pronoun refers to a pronoun that lacks clarity or specificity in terms of its antecedent, the word that it is replacing or referring to. This can lead to confusion or ambiguity in the sentence. To understand what a vague pronoun is, let's first understand what a pronoun is.

A pronoun is a word that is used to replace a noun or a noun phrase. It helps avoid repetition in language and makes sentences more concise. For example, instead of saying "John went to John's house, and John opened the door," we can say "John went to his house, and he opened the door" using pronouns.

However, a vague pronoun occurs when the pronoun lacks a clear antecedent, making it difficult to determine exactly what or whom the pronoun refers to. Here's an example:

"Sarah went to the store, and she bought something."

In this sentence, the pronoun "she" is vague because we don't know who it refers to. Is it Sarah or someone else? To fix this, we need to make the antecedent clear by specifying the noun it refers to:

"Sarah went to the store, and Sarah bought something."

Now, it is clear that the pronoun "she" refers to Sarah because we have a clear antecedent.

To avoid vague pronouns, it is important to ensure that the pronoun clearly refers to a specific noun or noun phrase mentioned earlier in the sentence or paragraph. If there are multiple potential antecedents, it is necessary to clarify or rephrase the sentence to maintain clarity.