Okay this is silly but me and my friend are having a grammar argument. I asked her to go to dinner via text message and she said she couldn't because she had to study for finals. I jokingly said "You always have an excuse" her response was "finals is a legitimate reason" I then jokingly corrected her and said "Finals ARE a legitimate reason." She said is was the appropriate form of the verb. I disagree. You wouldn't say "Beds is a good place to sleep" or "hummingbirds is pretty." Who is right?