Khanna is trying to clarify the precise meaning of the word incandescent. which strategy would be most in understanding this word?
1. go to the library and check out a book on electricity.
2. consult the first definition for the term in a dictionary.
3. use a thesaurus to determine the most common meaning.
4. use an encyclopedia to locate a description of the word.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."