The two sentences that include errors in the use of possessives or contractions are:
-
"Don't forget to pack your coat and hat, because its going to be snowing in Minnesota all week." (It should be "it's" instead of "its" because it's a contraction for "it is.")
-
"We are not certain who's textbooks these are, but we want to find out so that we can return them." (It should be "whose" instead of "who's" because "whose" is the possessive form used to indicate ownership.)
So the correct answers are:
- "Don't forget to pack your coat and hat, because its going to be snowing in Minnesota all week."
- "We are not certain who's textbooks these are, but we want to find out so that we can return them."