My Grammar and I (Or Should That Be 'Me'?): Old-School Ways to Sharpen Your English

party a discount on their rooms instead of The hotel is/are offering the wedding
party a discount on its/their rooms.
Adjectives treated as collective nouns – the rich , the homeless , the lonely – are
always plural and require a plural verb, e.g. the rich are getting richer .
I’m the leader of the pack/smack/shiver
There  are  scores  of  collective  nouns  to  describe  parts  of  the  animal  (and
particularly bird) kingdom. Some of them are genuinely useful (a flock of sheep
and  a  herd  of  elephants,  for  example,  if  sheep  and  elephants  crop  up  in  your
conversation to any great extent). Others are obscure or just plain silly, but here
is a small sample of them:

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a shrewdness of apes
a wake of buzzards
an intrusion of cockroaches
a pod of dolphins
a business of ferrets
a tower of giraffes
a bloat of hippopotamuses
a smack of jellyfish
a troop of kangaroos
a labour of moles
a parliament of owls
a bevy of quai l
an unkindness of ravens
a shiver of sharks
a streak of tigers
a descent of woodpeckers