to make a pronoun antecdent agreement ouut of this orginal sentence Each meber of the sorority has to make their own bed.

I would write it as Each member of the sorority had to make their own bed.
is that right?

original: Each member of the sorority has to make their own bed.

Each member of the sorority had to make her own bed.
or
The members of the sorority had to make their own beds.


"Each" indicates a singular; "their" is plural. Therefore you need to make them match (agree) -- either both plural or both singular.

=)

The autumn is my favorite season of the year.

To make a pronoun antecedent agreement out of the original sentence "The autumn is my favorite season of the year," you don't need to make any changes. The sentence already has pronoun antecedent agreement. "The autumn" is singular, so the pronoun "is" agrees with it correctly. Well done!