Is "what a lovely paper" grammatically correct? I know these are correct: 1) What a lovely dog! 2) What an ugly boy! But I don't know if the subject is an uncountable noun: 3) What a good paper! (?) 4) What a cold water! (?) Also, when it is plural: 5) What a good men! (?) 6) What a nice cars! (?) Should each "a" of 3), 4), 5) and 6) be eliminated? Thanks!