ENGLISH PRONOUN REFERENCE EXERCISE 1

Grammar review A pronoun should always point clearly to one specific noun. If a reader can't tell who or what it means, the sentence is confusing, even if the grammar is technically correct.

Two possible nouns: Sarah told Emma that her flight had been delayed. Whose flight, Sarah's or Emma's? Unclear.
No real noun at all: It mentioned in the email that the meeting was postponed. "It" isn't standing in for anything.
"This" pointing to a whole idea: He ate more vegetables. This improved his health. What exactly is "this"? Better to say "eating more vegetables."

Fix: repeat the actual noun, or rewrite the sentence so there's only one possible meaning.