Horses are a useful animal.这句话中的冠词a使用的对吗?

Horses are a useful animal.这句话中的冠词a使用的对吗? the horse is a useful horse表示一类马,那可不可以the horses are useful horses.这样的意思又是什么 horses are ----useful than cars a much more b many more c more many horses are useful animals/ a horse is a useful animal.马是有用的动物,这两句话哪句合适? The hourse is a useful animal.Horses are useful animal都是马是有用的动物,为什么第一个用is第二个 用are为什么the rice are not alway happy 用are 而 The hourse is a useful animal.用is 语法书上说不是特指，不是那匹 ----elephant is mush stronger than----horse.正确答案是An,a 为什么不能是The,the马是一种有用的动物可以这样表达：A horse is a useful animal.The horse is a useful animal.Horses are useful animals.既然定冠词和不定冠词 God horses are floating magical horses are clouds. There are many horses是什么意思 Are they horses?They are__________ Are they horses? _______, they_______ a useful These are my horses改单数句 how many horses are there是什么意思?快! The horses are here改倒装句 are this horses那里错了? Horses are _____ runners _____ people. are this horses那里错了