Accepting
a: Would you come join us at the table?
b: Sounds like fun. Thank you for suggesting.

=Accepting
a: Would you join us at the table?
b: Sounds like fun. Thank you for suggesting.

Refusing:
a: I`m going to have a home party next friday, will you come?
b: I`ll have to pass, because I have an commitment with another friends.

=Refusing:
a: I`m going to have a home party next Friday, will you come?
b: I`ll have to pass, because I have a commitment with another friend.