Ambiguous Reference
"When Samuel dropped the goblet onto the glass table, it broke." What broke?
The glass table.
"She was intelligent, but this did not help her grade." What's wrong with this?
We don't know if "this" refers to her intelligence or hard work.
"In Indiana, they grow corn" What is unclear?
Who grows the corn
Is it a vague or clear pronoun reference when the pronoun could refer to several nouns?
Vague
"When I banged my arm into the glass door, I broke it." What broke?
We don't know because it could refer to either
"She gave all her money to the Red Cross, and this is why she is poor" - What's wrong with this?
It should say something about the donation making her poor.
When Jeff and Rob finally escaped prison, he went to McDonald's.
Is this referring to Jeff or Rob?
Answer: Neither, the pronoun doesn't specifically refer to Rob or Jeff because I could refer to either noun.
"Ellen was late to work, missed her first appointment, and was reprimanded by her supervisor. This caused her to be disagreeable for the rest of the day" - Find the iffy part of this.
"This" doesn't have a specific noun it replaces.
"Harry was always late for class, which drove his teacher crazy" - What's wrong?